Antixenosis component of resistance to corn planthopper, Peregrinus maidis (Ashmead) in sorghum

Autor: B. U. Singh, D. D. R. Reddy, K. D. Reddy, B. M. Chandra Shekar
Rok vydání: 1993
Předmět:
Zdroj: International Journal of Tropical Insect Science. 14:77-84
ISSN: 1742-7592
1742-7584
DOI: 10.1017/s1742758400013424
Popis: Antixenosis component of resistance to corn planthopper, Peregrinus maidis (Ashm.) was investigated in 10 selected sorghum genotypes at three plant growth stages (30, 45 and 60 DAG) under laboratory and field (rainy and postralny seasons) conditions. In a free-choice test, the orientational and settling responses of nymphs and brachypterous adults on ail genotypes although influenced by the olfactory and visual responses, their feeding was not sustained due to gustatory stimuli indicating their significant role in determining the degree of antixenosis. The genotypes IS 18676, IS 19349 and IS 18677 showed a high degree of antixenosis in settling fewer nymphs and adults consistently at 30, 45 and 60 DAG. This finding was supported with low colonization of nymphs, and brachypterous and macropterous adults under field conditions. In addition, high degree of antixenosis for oviposition in both laboratory and field tests was evidenced on IS 18676 and IS 19349 at 30, 45 and 60 DAG, but on SPV 472 and SPV 475 only at specific plant growth stages. The variability in the rate of adult colonization together with suitability of plant growth stages for oviposition has contributed to variable degrees of antixenosis for oviposition.
Databáze: OpenAIRE
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