Management of Pod Borer Helicoverpa armigera (Hubner) in Chickpea Ecosystem
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Date
2012
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Publisher
UAS, Dharwad
Abstract
Studies on survey, surveillance and management of chickpea pod borer, Helicoverpa
armigera (Hubner) were conducted at AC, Bijapur and also in farmer’s field at Kallolli
village of Jamkhandi taluk Bagalkot during 2011-12.
The activity of chickpea pod borer was more or less same in all the taluks of Bijapur
district. However, the maximum pod borer larvae was recorded in Sindagi and Indi taluks
(upto 10.83 larvae /mrl), followed by Basavana Bagewadi, Bijapur and Muddebihal.
Chickpea as well as intercrops grown in chickpea based intercropping systems recorded
lower pod borer and its natural enemy, Campoletes chlorideae activity compared to chickpea
sole crop.
The surveillance of pod borer over a season indicated that the incidence of the pod
borer activity was noticed from 4th week after sowing reaching peak at 8th week after sowing
and then onwards decreased as the crop reaching maturity. Chickpea + wheat (3:6) recorded
lowest pod borer larvae/ mrl followed by chickpea + safflower (4:2), chickpea + sorghum
(1:2), chickpea + sorghum (2:4) and chickpea + sorghum sprinkled. The activity of the C.
chlorideae fluctuated with the host population over a season. Chickpea + wheat intercropping
recorded significantly highest crop equivalent yield of chickpea (7.50 q/ha) followed by
chickpea + safflower (7.01 q/ha), chickpea + sorghum sprinkled (6.97 q/ha), chickpea +
sunflower (6.60 q/ha), which were on par with the sole crop (7.00 q/ha). Chickpea + sorghum
intercropping recorded lowest crop equivalent yield of chickpea (6.15 q /ha).
Among the different spray sequences, rynaxypyr 20 SC- flubendiamide 480 SCemamectin
benzoate 05 SG treatment was found effective in recording lower pod borer larvae
and recorded the lower number of C. chlorideae cocoon compared to the sequential sprays
containing botanicals. With respect to cost effectiveness, rynaxypyr- flubendiamideemamectin
benzoate proved to be the best economical treatment as realized by the highest
benefit (` 4000/ha) and CB ratio (1:2). The next best treatments were profenophos- Btquinolphos
with benefit of ` 2080/ ha and CB ratio of 1:1.7 and neem oil- flubendiamideacephate
with benefit of ` 1880/ ha and CB ratio (1:1.6).