Management of Helicoverpa armigera (Hubner) in sunflower
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Date
2009
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Publisher
CCSHAU
Abstract
The present studies were carried out for screening of sunflower
genotypes for resistance to Helicoverpa armigera (Hubner), to correlate the H.
armigera population with some plant physical characters and abiotic factors, to
study the bio-efficacy of some insecticides against H. armigera and to estimate
the avoidable yield losses due to H. armigera in sunflower during rabi, 2008 at
Oilseed Research Area, Department of Plant Breeding, CCS HAU, Hisar.
The results obtained from these studies indicated that four genotypes
namely HSFH 1188, HSFH 1067, SH 3322 and KBSH 44 showed good level of
resistance to this pest. Two genotypes PSFH 914 and HSFH 1015 considered as
most susceptible. Among plant physical characters in relation to oviposition
and larval population of H. armigera the results revealed that plant height
showed significant negative correlation whereas, head diameter, days to
flowering initiation and days to fifty per cent flowering showed non-significant
negative correlation with oviposition and larval population of H. armigera.
Among abiotic factors temperature showed negative to oviposition and positive
correlation to larval population whereas relative humidity showed significant
positive to oviposition and negative correlation to larval population. Bright
sunshine hours showed significant negative to oviposition and positive
correlation to larval population. Rainfall and wind speed showed positive
correlation to oviposition whereas showed negative correlation to larval
population.
Spinosad was found most effective on the basis of mean per cent
reduction in H. armigera larval population which was at par with endosulfan
followed by quinalphos and indoxacarb. In field conditions, efficacy of
insecticides against H. armigera in descending order was spinosad >
endosulfan > quinalphos > indoxacarb > thiodicarb > profenophos > fenvalerate
> cypermethrin > Bt. Kurstaki. On the other hand cost benefit ratio was
maximum in case of endosulfan (1:21.3) followed by quinalphos (1:15.8) and it
was 1:5.5 in case of spinosad. Maximum avoidable yield loss (25.10%) and
increase in grain yield (33.50%) was recorded in plots treated with spinosad
followed by endosulfan.
Description
Keywords
Animal developmental stages, Genotypes, Eggs, Planting, Yields, Insecticides, Developmental stages, Sexual reproduction, Land resources, Crops