Vegetable Improvement Newsletter
No. 18, February 1976
Compiled by H.M. Munger, Cornell University,
Ithaca, New York
1. Transferring Powdery Mildew Resistance in Cucumber
Cornell University, Ithaca, N.Y.
There are several published reports on the inheritance of powdery mildew resistance in cucumber in which several genes, mostly recessive, have been identified. It has not been clear as to how readily a high level of mildew resistance can be transferred to a good horticultural variety that needs it. Therefore, our procedure in making such a transfer to 'Marketmore' may be of interest. Spartan Salad (MSU C7-63) was used as the source of resistance because it has more resistance than most plant introductions, showing no mildew in the field at Ithaca, and in the greenhouse in winter only a slight growth of mycelium on the older leaves and little or no sporulation.
Five backcrosses have been made following the initial cross of Spartan Salad x Marketmore, with Marketmore 70 used in the last 3 backcrosses and selfed after each cross. In each of the resulting segregating generations from 300 to 500 plants were grown at 2 x 2 inch spacing in flats in the greenhouse and inoculated by blowing spores over them as soon as cotyledons were well expanded. Susceptible and partially resistant plants were gradually eliminated and 5 to 10 of the most resistant plants finally selected for making the next backcross.
The highly resistant plant selfed in the F2 generation after the 5th backcross gave rise to uniformly resistant progenies, with a level of resistance essentially the same as that of Spartan Salad. Their yield, maturity, type, and mosaic and scab resistance all seem equivalent to Marketmore 70. Although this material has not been officially named and released, it will probably be named Marketmore 76.
No selection was done for downy mildew resistance at any time in the program, but it was reported from a trial in Mexico that there seemed to be resistance to downy mildew in this material. A greenhouse test in the fall of 1975 at Ithaca confirmed that Marketmore 76 is resistant to both mildews with DMR about the same as in Poinsett.
2. Breeding Snap Beans for Root Knot Nematode Resistance - A Status Report
Jim E. Wyatt, George Fassuliotis and John A. Wells
Agricultural Research Service, USDA, Charleston, South Carolina
A trial of advanced snap bean lines derived from crosses with PI 165426 was planted in a root-knot infested field at Tifton, Georgia. The predominant species of root-knot nematode present was Meloidogyne incognita. Roots were indexed 53 days after planting for root galling and egg masses. Nematode reproduction was estimated by measuring eggs/gram of root.
Two breeding lines were fully susceptible, one line was intermediate and six lines were resistant as determined by both root galling and egg mass indices. Both indices proved equally effective in estimating plant reaction, and the correlation coefficient between the two was r = 0.98. Egg counts were inconclusive as a measure of nematode reproduction.
Near isogenic lines differing in reaction to M. incognita have been established by identifying resistant and susceptible plants. We will continue our studies of these lines to determine the chemical nature of resistance, with a particular interest in chlorogenic acid. We also anticipate publicly releasing the resistant lines after further testing.
3. Root Rot Resistance in Snap Beans
J.E. Wyatt and P.D. Dukes
Agricultural Research Service, USDA, Charleston, South Carolina
Snap bean breeding plots planted here in August, 1975, were subjected to high temperatures and excessive rainfall. These conditions promoted the development of at least four seed and root rotting organisms that caused severe losses in many plots and provided an opportunity to effectively select for root rot resistance.
The planting consisted of both colored- and white-seeded lines with colored-seeded phenotypes comprising about 55 percent of the planting. Seedling survival 17 days after planting was 23% for colored-seeded lines and 14% for white-seeded. This data supports earlier work at this location indicating that root rot resistance in snap beans was correlated with pigmented seed coats.
4. Cercospora Leaf Spot of Southern Pea
R.L. Fery, P.D. Dukes, and F.P. Cuthbert, Jr.
U.S. Vegetable Laboratory, ARS, USDA, Charleston, S.C. 29407
We have had severe epiphytotics of a leaf spot incited by Cercospora cruenta Sacc. in all our fall southern pea planting since 1972. Although already recognized as a major foliage disease in several important production areas of the U.S., we feel that Cercospora leaf spot (CLS) may be responsible for far greater losses than realized at present. Preliminary analysis of data collected this past fall indicates that CLS reduced yields by almost 36%. Results of field tests run over a four year period have confirmed the presence of high levels of resistance in several accessions.
The inheritance of resistance in the breeding lines CR 17-1-34 and Ala. 963.8 was studied in parental, F1, F2, and backcross generations after crossing with susceptible cultivars. We found that the resistance in these two lines were conditioned by different genetic factors. Resistance in CR 17-1-34 was controlled by a single dominant gene and in Ala. 963.8 by a single recessive gene. The dominant and recessive genes have been designated Cls1 and cls2, respectively. Since both of these genes are already in improved type genetic backgrounds, the germplasm is now available to allow the immediate expansion of the objectives of the southern pea breeding programs to include CLS resistance. The breeding line CR 17-1-34 has been released for use in such programs.
5. Breeding Cowpea Curculio Resistant Southernpeas
R.L. Fery and F.P. Cuthbert, Jr.
U.S. Vegetable Laboratory, ARS, USDA, Charleston, S.C. 29407
Three cowpea curculio resistant southernpea breeding lines, CR 17-1-13, CR 18-13-1, and CR 22-2-21, were released to plant breeders this past spring. All are horticultural types suitable for immediate use in breeding programs. CR 17-1-13 has a pod factor that inhibits pod wall penetration by the adult curculio. CR 18-13-1 and CR 22-2-21 both have a nonpreference type resistance. Results of field tests conducted the past two years indicate these lines are as effective as the recommended insecticide in controlling the cowpea curculio. Our studies indicate that the pod factor and the nonpreference factor are complementary in effect. The pod factor is moderately heritable and controlled by a single effective factor. The inheritance of the nonpreference factor is currently under study.
6. Development of Isolation Cages for Controlled Spinach Pollination
D.W. Fankhauser, J.L. Bowers, M.J. Goode
University of Arkansas, Fayetteville, Arkansas
Early in the spinach breeding program at the University of Arkansas attempts were made to devise economical isolation cages to facilitate controlled pollination. Various types of muslin cloth or plastic covered frames failed in the field and greenhouse because environmental factors could not be controlled. We finally developed fairly economical chambers in a greenhouse environment with enabled us to operate the spinach breeding program year round. At Fayetteville, the yearly minimum and maximum temperatures ranged from -5 degrees to 105 degrees Fahrenheit. In order to maintain the desired range of 55 to 70 degrees in the chambers, a system capable of delivering outside air cooled as much as 35 degrees or warmed as much as 60 degrees was required.
Three seed crops have been successfully produced in 10 cages constructed on top of transite tables. We used 2 x 2 wood framing covered with 2 layers of 6 mil plastic containing ultraviolet inhibitors. Cages are 4 x 8 feet x 4 feet high, and each is divided into 4 isolation compartments. We have the capacity, therefore, to control pollination on 40 different lines at the same time. The greenhouse is cooled by 4 large forced air evaporative coolers, an automated top-venting system, side vents, and saran shade cloth. Heating is provided by 6 gas wall units.
Cool air or warm are is conveyed into each isolation compartment through a 4-inch galvanized stove pipe equipped with a damper. Connected to the stove pipe is a flexible 4-inch air conveyor tube which leads to an underground tunnel extending the full length of the greenhouse. The tunnel is 3 x 3 feet, constructed of concrete and insulated with one inch of Styrofoam glued to the inside walls. Controlled temperature air is conducted into the tunnel from heating and cooling units installed outside the greenhouse. These are controlled by a thermostat located, by trial and error, in an isolation chamber most representative of the system. The heating and cooling units consist of two 3-ton commercial units with heat pumps connected in tandem so as to supply 2 stages of heating and cooling. One stage operates if the outside air temperature range is between 70-85 degrees Fahrenheit or from 30-55 degrees Fahrenheit. The second stage begins when outside temperatures are more extreme.
All air moving through the system into the isolation compartments is outside air and free of spinach pollen. It moves ultimately into the
greenhouse through holes bored in the transite floor of compartments. Maintenance of positive pressure in compartments prevents entrance of foreign pollen through floor holes. A turbulator is used to mix greenhouse air and promote more uniform temperatures throughout.
Many details of the system have been omitted. If further information is desired, write the Department of Horticulture and Forestry, University of Arkansas.
7. Cucurbita Martineezii as a Source of Disease Resistance
Cornell University, Ithaca, New York 14853
In the fall of 1972, Dr. T.W. Whitaker showed me some plants of Cucurbita martineezii and said they probably had the highest level of resistance to powdery mildew of any species crossable with cultivated cucurbitas. He generously provided some seed, and our greenhouse tests confirmed its near-immunity. However, it is very difficult to get flowers on the species at Ithaca, and it was not until the late summer of 1974 that Rodney Sttetner’s watchfulness enabled him to pollinate some female flowers of
‘Butternut’ (C. moschata) with the very few males produced by C. martineezii.
The resulting F1 showed a high level of PMR both in the greenhouse and in the field in 1975. Its resistance is not as high as the resistant parent but far closer to it than to Butternut. Max Contin is studying the inheritance of resistance and its transfer to cultivated squashes of various species. The F1 showed no clear symptoms of mosaic (CMV) in the field in 1975 while melons nearby were severely affected. Both parents and the F1 were inoculated with CMV as young seedlings in the greenhouse in the fall of 1975. Again, C. martineezii and the F1 showed no symptoms while they were severe on Butternut. Two months after the inoculation, virus could not be recovered from the former two lots. Further testing is needed to confirm this apparent mosaic resistance, but at this point it looks more promising than other sources of CMV resistance we have found.
8. Evaluation of 15125 x 1453 ae du wx High Sugar Maize Hybrid
D.L. Garwood, Sandra Vanderslice, and W.C. Garman
Department of Horticulture, The Pennsylvania State Univ., University Park, Pa. 16802
The amylase extender (ae) dull (du) waxy (wx) genotype continues to show promise as a high sugar sweet corn type with improved post-harvest sugar retention properties. In 1975, total sugar content of the 15125x 1453 ae du wx hybrid was determined at 15, 18, 21, 24, 27, and 30 days after pollination. Total sugar contents expressed as a percentage of dry weight were 53.9, 40.1, 27.2, 26.4, 22.1, and 20.6% for these sampling dates. Expressed on a per kernel basis 16.7, 19.8, 19.7, 25.3, 25.9, and 24.2 mg of sugar were present at 15 through 30 days after pollination. This data indicates that high levels of sugar are present for at least a 10-day period. Other data from our laboratory has demonstrated that high levels of sugar are still present after 96 hr storage at both 4°C and 27°C.
Yielding ability of the 15125 x 1453 ae du wx hybrid was evaluated using a Latin Square design with plant populations of 12, 16, 20, and 24 thousand plants per acre in 450 sq. ft. plots. Plots were planted May 23, 1975 and harvested August 19, 22, and 25. The highest yield, 4.42 tons per acre of unhusked ears, was obtained with 20,000 plants per acre. The lowest yield 3.67 tons per acre occurred at the lowest plant population. Results indicate that acceptable yields can be obtained using ae du wx genotypes. Additional evaluations of horticultural characteristics of this promising genotype are continuing.
9. Sweet Corn Breeding Questionnaire Summary
Department of Horticulture, The Pennsylvania State Univ., University Park, Pa. 16802
Information has been compiled concerning (1) maintenance of publicly released su inbreds, (2) maintenance of publicly released du, sh2, and su2 inbreds in sweet corn backgrounds, (3) open pollinated sweet corn (su) variety maintenance and (4) mutant genes being incorporated by backcrossing into sweet corn inbreds and varieties. Copies of the summary are available upon request. Information from individuals not previously contacted would be appreciated.
10. Uncatalogued Vegetable Varieties Available for Trial in 1976
This list is aimed at facilitating the exchange of information
about potential new varieties, or new varieties which have
not yet appeared in catalogues. Persons conducting vegetable
variety trials who wish seed of items on this list should
request samples from the sources indicated.
It is the responsibility of the person sending out seed
to specify that it is for trial only, or any other restriction
he may want to place on its use.
Crops are listed alphabetically. For each entry the following
information is given: Designation, source of trial samples,
outstanding characteristics, variety suggested for comparison
(not given separately if mentioned in description), status
of variety (preliminary trial, advanced trial, to be released,
or released) and contributor of information if different
from source of trial samples. Where several samples are
listed consecutively from one source, the address is given
only for the first.
- Dry Edible Bean
- GN-CB-BW-71-44. Dermot P. Coyne, Dept. of Horticulture, Univ. of Nebraska, Lincoln, Nebraska 68508. First Great Northern variety to combine high tolerance to 3 strains of bacterial wilt (Corynebacterium flaccumfaciens), orange, yellow, and purple and common blight (Xanthomonas phaseoli) and earliness. Compare with Great Northern UI59. To be released 1976.
- Jupiter. Robert C. Tang, Dessert Seed Co., P.O. Box 181, El Centro, Calif. 92243. A second early hybrid. Non-branching. Fine buds. Even dark green color. Very uniform. Solid stem. Compare with Green Duke. To be released.
- Hyb. E. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Large early center head with medium sized buds on downy mildew tolerant plant. Compare with Green Comet. To be released. (R.O. Wilkins).
- Venus. R.L. Engle, Dessert Seed Co., Inc., P.O. Box 9008, Brooks, Oregon 97305. Early maturing, small uniform heads. Short core. Hybrid. Compare with Emerald. Released.
- Cole Cash. Tom V. Williams, FMC Corp. Late maturing, vigorous, large framed, well wrapped hybrid, blue-green. For fresh market or kraut. Slightly flattened heads with medium core. Holds well and has shown excellent tip burn resistance. Compare with Rio Verde or A&C #5. Released.
- Hybrid 1241. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Black rot and yellows resistant. Round blue-green solid market cabbage. Compare with Hyb. #15. To be released. (R.O. Wilkins).
- Hybrid 1245. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Black rot and yellows resistant, round, bright green, solid market cabbage. Compare with Market Victor or Copenhagen. To be released. (R.O. Wilkins).
- 76AN. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Tubular shape and good color. Compare with Hipak. Preliminary trial.
- 6K13. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Long Nantes. Compare with Hipak. Preliminary trial.
- EN13. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Long Nantes type with good color. Compare with Hipak. Preliminary trial.
- 75647. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Compare with Grenadier. Preliminary trial.
- 756SP. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Long Imperator type. Compare with Grenadier. Preliminary trial.
- 791AN. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Smooth root with good color. Compare with Trophy. Preliminary trial.
- 6KAN. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Long Imperator with good color and smooth root. Compare with Trophy. Advanced trial.
- 11M11. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. SMR pickle with vigorous plant. Advanced trial. (R.C. Dumlao).
- 3811. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. SMR pickle, dark color, early, high yield. Compare with Greenpak. Advanced trial. (R.C. Dumlao).
- Lucky Strike. Petoseed Research Center, Route 4, Box 1255, Woodland, Calif. 95695. Dark green pickling cucumber with resistance to scab, CMV, downy mildew, powdery mildew, anthracnose, angular leafspot. Compare with Carolina. To be released. (Colen Wyatt).
- Peto Triplemech. Petoseed Research Center. Dark green pickle, highly gynoecious, resistant, resistant to scab, CMV, anthracnose, downy mildew, powdery mildew, and angular leaf spot. To be released. (Colen Wyatt).
- PSR 574. Petoseed Research Center. Medium green pickle with resistance to CMV, downy mildew, anthracnose, angular leaf spot, scab. Advanced trial. (Colen Wyatt).
- PSR 2574. Petoseed Research Center. Medium green pickle with resistance to CMV and scab. Advanced trial. (Colen Wyatt)
- PSR 3073. Petoseed Research Center. Medium green pickle with resistance to CMV, scab, anthracnose, downy mildew. Advanced trial. (Colen Wyatt).
- AR72-14-17 and AR74-118B. J.L. Bowers, Dept. of Horticulture and Forestry, Univ. of Arkansas, Fayetteville, Arkansas 72701. Outstanding internal fruit quality characters and high level of anthracnose resistance. Compare with Chipper. AR74-118B has been rated very highly resistant to anthracnose, powdery mildew and bacterial wilt and possesses good internal
fruit qualities. AR72-14-17 does not possess as high a level of disease resistance but has better fruit quality characters. Advanced trial.
- Marketmore 72. H.M. Munger, Dept. of Plant Breeding, Cornell University, Ithaca, N.Y. 14853. Marketmore 70 with non-bitter gene added by 7 backcrosses. Fruit type, resistance and performance essentially the same as Marketmore 70.
- Marketmore 76. H.M. Munger. Similar to Marketmore 70 but with resistance to powdery mildew and downy mildew. (See research note) To be released.
- Poinsett 76. H.M. Munger. Uniform fruit color and scab resistance backcrossed into Poinsett. Fruit may be slightly longer than Poinsett. To be released.
- 64BSR. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. Dark color and early. Compare with Classic. Advanced trial. (R. Dumlao).
- 68BSR. C.H. Cadregari. Very dark color and erect plant. Compare with Classic. Advanced trial. (R. C. Dumlao).
- 65BSR. C.H. Cadregari. Early, dark color, and oval shape. Compare with Black Magic. Advanced trial. (R.C. Dumlao).
- S4CA. C.H. Cadregari. Early, extra dark color, and long cylindrical fruit. Compare with European long types. Advanced trial. (R.C. Dumlao).
- SG-12. Robert C. Tang, Dessert Seed Co., P.O. Box 181, El Centro, Calif. 92243. F1 hybrid. Large size, thick flesh, very sweet, vigorous vine, Fusarium resistant. For fresh market or home garden use. Compare with Saticoy Hybrid. Advanced trial.
- Alaska. Petoseed Research Center, Route 4, Box 1255, Woodland, Calif. 95695. Very early and high quality. Compare with Mainerock. To be released. (Paul Thomas).
- Matador. Tom V. Williams, FMC Corporation, Box 2508, El Macero, CA 95618. Uniform, high globe intermediate storage hybrid; firm yellow flesh, tight, lusterous, copper scales. Compare with Downing Yellow Globe. Released.
- Dexp. 2008. R.L. Engle, Dessert Seed Co., Inc., P.O. Box 9008, Brooks, Oregon 97305. Early maturing YSS x DYG hybrid with long storage life and excellent quality. Compare with Fiesta. To be released.
- Dexp. 2012. R.L. Engle. High yielding, long storage hybrid with strong golden brown scales. Compare with Epoch. Advanced trial.
- Early Jalapeno. Petoseed Research Center, Route 4, Box 1255, Woodland, Calif. 95695. Small compact plant with very concentrated fruit set. Suitable for mechanical harvest. Medium green fruits mature to red. Hot. Advanced trial. (Albert Yu).
- Petite Yellow Sweet. Petoseed Research Center. Much smaller pods than Sweet Banana Wax, light yellow fruits mature to red. Small compact plant with concentrated fruit set. Very productive. Released. (Albert Yu).
- TMR Cubanelle. Petoseed Research Center. Slightly shorter pods than Cubanelle and more concentrated set. TMV resistant. Advanced trial. (Albert Yu).
- PSR 175. Petoseed Research Center. Very early, mostly 4-lobed, blocky bell pepper. Small compact plants with very concentrated fruit set. TMV resistant. Advanced trial. (Albert Yu).
- PSR 375. Petoseed Research Center. Very large bells, mostly 4-lobed, medium green maturing to red. Medium large plants, a little sprawling. TMV resistant. Advanced trial. (Albert Yu).
- Exp. 76-1. T.C. Torrey, W. Atlee Burpee Co., 335 South Briggs Road, Santa Paula, CA 93060. A naked seeded small sugar type with dark orange skin and flesh color and edible seeds. Triple purpose pumpkin. Compare with Small Sugar. To be released.
- Southern Pea
- AR74-789. J.L. Bowers, Dept. of Horticulture and Forestry, Univ. of Arkansas, Fayetteville, Arkansas 72701. Pod set extremely concentrated and considerably above foliage level. Compare with Crimson and Pinkeye Purple Hull. Advanced trial.
- C1AGB (Summer Squash). C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y. 14624. Dark green zucchini. Compare with Ambassador. To be released.
- 7C. C.H. Cadregari. Crookneck with early heavy yield. Advanced trial.
- PSR 3273 (Summer Squash). Petoseed Research Center, Route 4, Box 1255, Woodland, Calif. 95695. Yellow, straight, slender fruits with medium length and very smooth. Plants are small and open. Early maturity. Advanced trial. (Albert Yu).
- NEB.BN-72-20-1. Dermot P. Coyne, Dept. of Horticulture, Univ. of Nebraska, Lincoln, Nebraska 68508. Yield, maturity, fruit size and vine vigor comparable to Waltham Butternut and superior flavor comparable to Asgrow 23. True crookneck fruit have not been observed in three years of trials. Derived from the cross New Hampshire Butternut x Asgrow 23. To be named
and released in spring 1976.
- NEB.BN-72-9-1. Dermot P. Coyne. Very uniform, medium size Butternut, free of crooknecks. Comparable to Asgrow 23 in size and quality, but earlier in maturity and with smaller vines. Derived from the cross New Hampshire Butternut x Asgrow 23. To be released in spring 1976.
- 73-1. H.M. Munger, Dept. of Plant Breeding, Cornell University, Ithaca, N.Y. 14853. Butternut type with short vine and fruit set near crown. Fruit size, quality and yield similar to Butternut 23. Advanced trial.
- Sweet Corn
- Epic. Tom V. Williams, FMC Corporation, Box 2508, El Macero, CA 95618. Large, attractive, well filled ears, 16-20 rows, deep kernels, excellent yielding ability, head smut tolerant. Compare with Jubilee. Released.
- 39-7Q. C.H. Cadregari, Joseph Harris Co., Inc., 3670 Buffalo Road, Rochester, N.Y 14624. White corn, gold cup type and yield, 83 days. Compare with Silver Queen. Advanced trial. (E.W. Scott).
- Onthyb 7411. E.A. Kerr, Horticultural Exp. Station, Box 587, Simcoe, Ontario, Canada N3Y 4N5. Exceptionally high eating quality in late corn. Compare with Stylepak. Advanced trial.
- VH735. E.A. Kerr. Very high quality for roadside and home garden. Compare with Tastyvee. Advanced trial.
- VH701. E.A. Kerr. High quality roadside and shipping variety. Compare with Butterfingers. Advanced trial.
- Columbia. Mark W. Martin, Research and Extension Center, Prosser, Wash. 99350. Resistant to curly top virus, V and F. Very high yields, larger fruit than Roza or Ace. To be released.
- Roza. Mark W. Martin. Resistant to curly top virus, verticillium wilt and fusarium wilt. Very high yields, sets well under adverse conditions. High vitamin C and viscosity. An excellent variety for home gardens where curly top is a problem. Good for home canning and slicing for the table. Also useful for U-pick or roadside stand enterprises. Compare with Ace, Columbia. To be released.
- Rowpac. Mark W. Martin. Resistant to curly top virus, V and F. Sets very well. Firm, concentrated ripening and early. Adapted to machine harvest. Can be used as an early fresh market type or machine harvested for processing. Compare with VF145-21-4 and other machine harvest types. To be released.
- Saladmaster. Mark W. Martin. Resistant to curly top viruses, V and F. Excellent flavor, color, soluble solids, vitamin C. High yielding large cherry type. Intended to establish a new type of fresh market tomato, larger than the traditional cherry types, for quartering into wedges for salads or for eating in lunchboxes. To be released.
- D-9. Robert C. Tang, Dessert Seed Co., P.O. Box 181, El Centro, Calif. 92243. Very early, resistant to fusarium, verticillium and grey leaf spot. Determinate. Concentrated maturity. F1 hybrid. Compare with Florida MH 1. Advanced trial.
- Willamette VF. H.M. Munger, Dept. of Plant Breeding, Cornell University, Ithaca, N.Y. 14853. Maturity and yield similar to Heinz 1350 but more crack resistant and better flavor. Resistance to Verticillium and race 1 Fusarium incorporated into Willamette by backcrossing. To be released.
- VF275. H.M. Munger, Dept. of Plant Breeding, Cornell University, Ithaca, N.Y. 14853. Only slightly later than New Yorker with smoother, firmer fruit and better flavor. Resistant to Verticillium and Fusarium race 1. Compare with Fireball or New Yorker. Advanced trial.
- V716. E.A. Kerr, Horticultural Exp. Station, Box 587, Simcoe, Ontario, Canada N3Y 4N5. Large mid-season, pear for pick-your own harvest. Satisfactory quality but not sufficient concentration of firmness for mechanical harvest. Compare with Roma VF. To be released.
- V719. E.A. Kerr. Mid-season, machine-harvest type with heart-shaped fruit, suitable for product. Compare with Lafayette. Advanced trial.
- V738. E.A. Kerr. Very firm, hand-pick, with high ratings for both wholepack and product. Compare with Heinz 1350. Advanced trial.
- Ont 746. E.A. Kerr. Large, early, jointless, crimson pear, suitable for lye-peeling. Advanced trial.
- Ont 747. E.A. Kerr. Mid-season, jointless variety for product, high recovery. Compare with Dorchester. Advanced trial.
- Ont 752. E.A. Kerr. Very early, round, core-less, machine harvest type. Suitable for direct seeding in Ontario. Compare with Heinz 1706. Preliminary trial.
- Ont. 7512. E.A. Kerr. Large, hand-pick type for product or market. Compare with Veebrite. Preliminary trial.
- Hybrid PSR 6175. Petoseed Research Center, Route 4, Box 1255, Woodland, Calif. 95695. Medium maturity, good quality, resistant to Fusarium wilt. Compare with Crimson Sweet. Preliminary trial. (Paul Chung)
- Exp. 76-2. T.C. Torrey, W. Atlee Burpee Co., 335 South Briggs Road, Santa Paula, CA 93060. Short internode, dwarf, ice-box type, taking less space than standing watermelons. To be released.
11. Stocks Desired
Requests from Dr. J.L. Bowers, Dept. of Horticulture and Forestry, University of Arkansas, Fayetteville, Arkansas 72701:
- For Southern Peas: Material which may possibly possess resistance to common blight (Xanthomonas vignicola)
- For Cucumbers: Resistance to Rhizoctonia fruit rot.
- For Spinach: Fusarium wilt resistance.