Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/70595
Authors: SAILAJA, V
Advisor: LOKA REDDY, K
Title: DIFFERENTIAL PREFERENCE OF MAIZE GENOTYPES TO SESAMIA INFERENS WALKER AND ESTIMATION OF AVOIDABLE YIELD LOSSES WITH ENDOSULFAN
Publisher: ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Language: en
Type: Thesis
Series/Report no.: D8451;
Agrotags: DIFFERENTIAL, PREFERENCE, MAIZE, GENOTYPES, SESAMIA, INFERENS, WALKER, ESTIMATION, AVOIDABLE, YIELD, LOSSES, ENDOSULFAN
Abstract: Studies were undertaken on “Differential preference of maize genotypes to Sesamia inferens Walker and estimation of avoidable yield losses with endosulfan” under field conditions during rabi, 2008-09 and laboratory investigations were taken up to study the ovipositional preference of pink borer to selected maize genotypes at Maize Research Center, All India Co-ordinated Maize Improvement Project (AICMIP), ARI, Rajendranagar during 2008. The varietal screening studies of ten maize genotypes were carried out under field conditions with artificial infestation of S. inferens and the classification of the maize genotypes was done based on the dead hearts and leaf injury rating. Among the ten maize genotypes, Madhuri (5.03) was classified as highly resistant genotype, while BML 7 (5.33) was placed under resistant category. The genotype, HKI 163 (5.87) was classified as moderately resistant genotype The remaining five genotypes viz., HQPM 1 (6.50), MP 717 (6.93), BML 6 (7.03), BH 40625 and BH 1576 (7.90) were grouped as highly susceptible. The ovipositional preference studies of maize genotypes by S. inferens indicated that the susceptible check, Basi local was more preferred for egg laying while the resistant check, CM 500 was less preferred. The resistant genotype, BML 7 recorded significantly more number of eggs under choice and no choice conditions while Madhuri, the highly resistant genotype recorded more eggs under no choice condition while under choice condition, it laid fewer eggs. The distribution pattern of eggs on different leaf sheaths indicated that the moth preferred to lay more than 55% of eggs on first leaf sheath and the basal and second leaf sheaths were either less preferred or not preferred for oviposition. The effect of crop growth stages and larval densities of S. inferens on grain yield of maize crop under unprotected conditions indicated that the plants artificially infested with S. inferens larvae at 2 leaf stage (7 DAE) of crop showed maximum reduction in grain yield (47.59 q ha-1 at 2 leaf stage as against 53.44, 59.84 and 67.34 q ha-1 at 4, 6 and 8 leaf stage, respectively) irrespective of the larval densities. The crop protected with endosulfan at 2 leaf stage recorded maximum avoidable yield loss ranging from 18.17% to 45.39% with different larval densities (0, 5, 10, 15 and 20 larvae per plant) and hence spraying of endosulfan at early stages of crop growth was highly effective for managing S. inferens and for obtaining higher yields.
Issue Date: 2009
Appears in Collections:Theses

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