Influence of Resistant and Susceptible Corn Silks on Selected Developmental Parameters of Corn Earworm (Lepidoptera: Noctuidae) Larvae1

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Abstract
Evidence is presented that both nonpreference and antibiosis resistance to feeding are manifested in the silks of ‘Zapalote Chico’ (ZC) corn to Heliothis zea (Boddie). Fewer larvae survived on ZC silks than on silks of 471-U6 × 81-1 or ‘Stowell’s Evergreen’ (SEG). Larvae reared on ZC silks weighed significantly less than those reared on silks from 471-U6 × 81-1 or SEG. In two choice tests, after 4 days, significantly more larvae which had been placed on silks of ZC were found on silks of SEG (19 vs. 8] % and 7.5 vs. 92.5%). When larvae were placed on SEG silks for 4 days, significantly more larvae were found on SEG silks than on ZC silks (89 vs. 11 % and 92.5 vs. 7.5%). When CEW larvae were not placed on silks but were given a choice of SEG and ZC silks, significantly more larvae chose SEG silks (94 vs. 6%).

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