RESPONSE OF (Glycine max (L.) Merr.,) GENOTYPES AGAINST Spodoptera littoralis BASED ON AGRO-MORP....

In Egypt, defoliating insects can cause serious damage to soybean plants. Cotton leaf worm (Spodoptera littoralis) is a severe soybean pest and one of Egypt's most economically important insect pests. Under natural field conditions, the susceptibility of 15 soybean genotypes to infestation by the cotton leaf worm Spodoptera littoralis was investigated. The link between agromorphological and molecular DNA and leaf defoliation was also investigated. In the field screenings system, defoliation of examined plants by the cotton leaf worm revealed that genotypes L105 and L153 had the greatest values of insect resistance and defoliation ranking from zero to 0.1, respectively, followed by genotypes H10L10A, L162, and H1L1. During both seasons, the AGS-129 genotype displayed the highest insect susceptibility (4.0), indicating extensive insect feeding. Furthermore, L 153, H10L10A, and H1L1 had the highest seed yield/fed values, which was attributed to a significant increase in the number of branches/plant, 100-seed weight, and number of pods/plant over both seasons, indicating that those genotypes are promising and could be suggested for release; these genotypes also revealed high insect resistance to cotton leaf worm. A total of 13 SSR primers are used to amplify 45 bands. Cotton leaf worm resistance was successfully distinguished among soybean genotypes using polymorphic SSRs. In general, several soybean genotypes, such as H153, H105, L162 H1L1 and H10 L10, are seen to be promising genotypes that could be utilised in cultivation to increase soybean resistance to cotton leaf worm.

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