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Cucurbit Genetics Cooperative Report 2:28 (article 17) 1979

Preliminary Report on Association of Diabrotica Resistance and Morphological Characters in Watermelon

B. B. Rhodes

Edisto Experiment Station, Blackville, SC 29817

Chambliss and Cuthbert (1) determined that resistance to Diabrotica in watermelon was controlled by a single recessive gene. No association between this gene and other genes has been reported. We are currently investigating the assortment of genes for Diabrotica resistance, dwarf habit, entire leaf, fruit shape, and seed size.

Lines inbred for four generations from crosses with 'Sugar Loaf', a Diabrotica resistant cultivar, were obtained from F. P. Cuthbert (U.S. Vegetable Lab, Charleston, SC). These were selfed and first evaluated for field resistance in 1977 (Table 1).

F1, F2, and backcross populations have been obtained among F5 Diabrotica lines and cultivars with contrasting morphological characters. Field resistance ratings and scoring of morphological characters will be made in the field in 1979.

Table 1. Striped cucumber beetle populations and damage ratings of watermelon lines and cultivars.

Genotype z

No. beetles/plant y

Damage index

E56

0.00

0.01

E61

0.04

0.07

E51

0.07

0.10

E67

0.07

0.37

E69

0.08

0.13

E66

0.10

0.24

E60

0.10

0.04

E68

0.13

0.20

Sunshade

0.56

1.44

Coconutmelon

0.92

0.36

Charleston Gray

0.92

0.54

Kengarden

1.15

0.54

Supersweet

1.38

0.76

Crimson Sweet

1.60

0.72

Chris Cross

2.25

0.92

Allsweet

2.29

0.71

Jubilee

2.75

1.00

z Diabrotica resistant lines are designated E
y Mean beetle number per sampling date.

Literature Cited

  1. Chambliss, 0. L. and F. P. Cuthbert, 1969. Biennial Report of Veg. Breeding in the Southern U.S., Hawaii, and Puerto Rico. U. S. Vegetable Breeding Lab, Charleston, SC, p. 51.
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Page citation: Wehner, T.C., Cucurbit Genetics Cooperative;
Created by T.C. Wehner and T. Ng, 1 June 2005; design by C.T. Glenn;
send questions to T.C. Wehner; last revised on 23 October, 2009