European corn borer resistance in sorghum compared with maize

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Dharmalingam, Sinniah
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The Department of Entomology seeks to teach the study of insects, their life-cycles, and the practicalities in dealing with them, for use in the fields of business, industry, education, and public health. The study of entomology can be applied towards evolution and ecological sciences, and insects’ relationships with other organisms & humans, or towards an agricultural or horticultural focus, focusing more on pest-control and management.

The Department of Entomology was founded in 1975 as a result of the division of the Department of Zoology and Entomology.

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A total of 211 sorghum, Sorghum bicolor (L), genotypes were evaluated (1981, 1982, and 1983) for resistance to leaf feeding by 1st-generation European corn borer (ECB), Ostrinia nubilalis Hubner, larvae under heavy infestation conditions (ca. 750 eggs/plant). All sorghum hybrids were resistant. Some sorghum hybrids were not as resistant, however, as a highly resistant inbred line of maize, Zea mays L;First-generation larval mortality was rapid on four sorghum hybrids (92.2 - 97.7% mortality within 6 days after egg hatch), but larval mortality was not as rapid on four sorghum hybrids as was larval mortality on a resistant maize inbred (99.1 - 99.7% mortality within 6 days after egg hatch). The majority of 22,827 1st-generation larvae fed on leaf tissue in the moist area deep in the whorl of sorghum and maize plants. Resistance in sorghum, as in maize, to 1st-generation ECBs, therefore, is resistance to leaf feeding (a high level of antibiosis against 1st- and 2nd-instar larvae). Dried-ground leaves (substituted for wheat germ in a meridic diet) of resistant genotypes of sorghum and maize had no deleterious effect on survival and development of ECB larvae compared with a diet containing leaves of susceptible maize and compared with a standard wheat germ diet;Second-generation larval mortality was rapid on four sorghum hybrids (93.9 - 98.9% mortality within 6 days after egg hatch) and on two resistant maize inbreds (92.6 - 97.8% mortality within 6 days after egg hatch). The majority of 33,690 2nd-generation larvae fed on sheath-collar tissue through 35 days after egg hatch of sorghum plants and through 15 days after egg hatch on maize plants. Resistance in sorghum to 2nd-generation ECBs as in maize, therefore, is resistance to sheath-collar feeding (a high degree of antibiosis against 1st- and 2nd-instar larvae).

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Sat Jan 01 00:00:00 UTC 1983