STUDIES ON THE MANAGEMENT OF POD BORER, Helicoverpa armigera (Hubner) IN PIGEONPEA ECOSYSTEM
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Date
2001-08-06
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
Studies undertaken at Agricultural Research Station Gulbarga during 1997-98 and 1998-
99 seasons indicated that house sparrow, Passar domesticus (Linnaeus), the Conunon myna,
Acridotheres tristis Latham, black drongo, Dicrurus adsimilis (Bechstein), small green bee eater
Merops orierUalis Latham are the important predacious insectivorous birds on the pigeonpea pod
borer, Uelicoverpa armigera (Hubner). The predatory distance of birds from perching place
revealed that upto two metres these birds could pick the larvae effectively. The gut aitalysis
indicated black drongo to be the most efficient predator followed by house sparrow and common
myna. The small green bee eater preferred dipterans, hymenopterans and odonatens that are more
beneficial dius causing reduction in natural enemy population.
HaNPV @ 250LE ha-1 along with 0.5 per cent sugar and any of the UV protectants like
activated charcoal, boric acid and blue at 0.1 per cent was found to record significantly lower
pod damage and higher grain yield irrespective of application time as compared to HaNPV
alone. Among the adjuvants, activated charcoal proved most effective recording at par higher
grain yield irrespective of application time compared to other adjuvants.
Though methomyl 12.5L @ 500g and profenofos 50EC @ 1500g a.i. ha-1
recorded highest occlusion both in freshly laid and older eggs die lowest dosage of
methomyl (I25g a.i.ha*') was equal to highest dosage (1500g a.i.ha-1) of profenofos 50EC in
terms of egg occlusion irrespective of the age of the egg.
Five peak moth catches were noticed in light and pheromone traps, die longest peak was
observed from 43 standard week to 52 standard week which coincided with peak reproductive
stage of the crop. The multiple regression analysis indicated maximum and minimum
tempeiatuie with afternoon relative humidity to influence the light and pheromone trap catches.
Evaluation of different IPM modules indicated the adaptive module consisting of ovicidal
application of profenofos 50EC at lOOOg a.i.ha NSKE (5.00%), HaNPV 250LE per ha
followed by alphamethrin lOEC at 50g a.i. ha-1 and biointensive module consisting of
application of HaNPV 250LE ha-1 hand collection. Bacillus thuringiensis l.O kg ha-1, NSKE 5
per cent followed by HaNPV 250LE ha-1 were found cost effective. However, the adaptability of
biointensive IPM module depends to the larger extent on their availability.
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