Crop habitat diversification, planting time and plant geometry for management of chilli pests
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Date
2013
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UAS Dharwad
Abstract
Investigations on effect of different cropping systems, planting time and planting
geometry; influence of different genotypes on chilli pests and evaluation of new molecules
and their effect on natural enemies were carried out during 2008-09 and 2009-10 at the Main
Agricultural Research Station, UAS, Dharwad.
Lowest incidence of sucking pests, leaf curl index, larval population of Helicoverpa
armigera (Hub.) fruit damage with higher yield and net returns were obtained from different
cropping systems when compared to sole chilli. The coccinellids and chrysopids were found
in large numbers in different cropping systems (intercropping, trap cropping and border/
barrier cropping).
Significantly lower level of sucking pest, leaf curl index, larval population of H.
armigera and fruit damage was observed in the crop with July 15th planting and 90x60 cm
spacing. The interaction effect among date of planting and different spacing was significant.
Dry chilli yield was significantly highest with July 15th planting and 90x60 cm spacing (4.21
q/ha) followed by July 30th and 90x60 cm (4.09 q/ha) and July 15th and 75x45 cm (3.81 q/ha).
Similar pattern of treatment significance was observed in case of predator population also.
The cultivars viz., Sarpan hybrid, Tejashwini and Sankeshwar recorded relatively
lower sucking pest population, leaf curl index, larval population of H. armigera and fruit
damage when compared to popular varieties viz., Byadagi kaddi and Byadagi dabbi which
exhibited these phonological characters at lower levels.
Thiamethoxam 25WG @ 1 g/l, abamectin 1.8EC @ 0.5 ml/l, diafenthiuron 50 WP @
0.75 g/l were found highly effective against sucking pests. Against H. armigera, novaluron
10 EC @ 0.75 ml/l, emamectin benzoate 5SG @ 0.4 g/l and spinosad 45SC @ 0.3 ml/l were
found quite promising. Significantly highest yield (4.65 q/ha) recorded in diafenthiuron 50
WP @ 0.75 g/l with higher net returns (Rs 22,661/ ha).