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Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...

Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...

Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...

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Figure 1. Frequency distribution plots of F 2 data for the four watermelon families (resistant PI accessions by<br />

susceptible cultivars of <strong>Citrullus</strong> <strong>lanatus</strong> var. <strong>lanatus</strong> and citroides) screened for resistance to gummy stem<br />

blight in greenhouse and field tests in North Carolina (2002-2003). Disease assessment scale adopted for the<br />

screening: 0 = no disease; 1 = yellowing on leaves (suspect of disease only); 2 to 4 = symptoms on leaves only;<br />

5 = some leaves dead, no symptoms on stem,; 6 to 8 = symptoms on leaves and stems; 9 = plant dead.<br />

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