Studies on Seasonal Abundance, Varietal Preference and Management of Helicoverpa armigera (Hubner) in Tomato (Lycopersicon esculentum Mill.)
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Date
2007
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Publisher
MPUAT, Udaipur
Abstract
Field trials were carried out against tomato fruit borer H. armigera (Hub.),
during kharif, 2006 at Horticulture Research Farm, Rajasthan College of Agriculture,
Udaipur.
In seasonal variation the H. armigera larvae first appeared during first week of
September. The peak populations of larvae were observed on variety Abhiruchi, S-22,
Arka Abhinava and Navodaya Type during 43rd, 42nd, 40th and 42nd meteorological
week respectively, and population of larvae were declined in first week of December.
The population of H. armigera larvae were found positively correlated with average
temperature and negatively correlated with average relative humidity in all tomato
varieties.
Four tomato varieties viz., Abhiruchi, S-22, Arka Abhinava and Navodaya
Type were screened on the basis of food utilization indices of penultimate instar
larvae of H. armigera. Variety S-22 was found to be the least preferred by H.
armigera. Larvae as the values of ECI, AD, ECD, GI, LPI, and SI were minimum and
it was followed by variety Abhiruchi and Arka Abhinava. Variety Navodaya Type
was found to be the most preferred, as utilization indices were maximum as compared
to other varieties. On the basis of food utilization and growth indices, the preference
of four tomato varieties in ascending order was: S-22 < Abhiruchi < Arka Abhinava <
Navodaya Type.
Field screening of four varieties of tomato on the basis of percentage fruit
damage, was also worked out. S-22 was rated as less preferred (11.25% damage),
Arka Abhinava and Abhiruchi were moderately preferred (22.48 and 20.27% damage)
and Navodaya Type was rated as preferred (31.49% damage).
Description
Studies on Seasonal Abundance, Varietal Preference and Management of Helicoverpa armigera (Hubner) in Tomato (Lycopersicon esculentum Mill.)
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Citation
Dhakar and kumar, 2007