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Impact of Crop-crop diversity on pod borer (Helicoverpaarmigera) of pigeonpea (Cajanuscajan)

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Title Impact of Crop-crop diversity on pod borer (Helicoverpaarmigera) of pigeonpea (Cajanuscajan)
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Creator M. Srinivasa Rao*,C.A Rama Rao, G.Sree Vani, andEAnjaiah
 
Subject pigeonpea, Cajanus cajan, intercropping, Helicoverpa armigera, grain damage, agronomica evaluation
 
Description Not Available
An experiment was conducted during rainy (kharif) season 2003 and 2004 at Hyderabad to study the impact of crop -crop diversity on incidence of pod-borer [Helicoverpa armigera (Hubner)] on pigeonpea [Cajanus cajan (L.) Millsp]. The incidence of major pod-borer H. armigera varied temporally across cropping systems and significant fluctuation was noticed even at peak level of population (13-16 weeks after sowing). Intercropping also caused significant variation in pod and grain damage by pod-borers Maruca vitrata (Geyer), Exelastis atomosa (Walsingham) and Melanagromyza obtusa (Malloch). The intercrops, viz sorghum (Sorghum bicolor L.), groundnut (Arachis hypogaea L.) and blackgram (Vigna mungo (L.) Hepper) reduced the pod damage by H. armigera, M. vitrata, and M. obtusa significantly. The grain damage by lepidopteran borers was less in pigeonpea + sorghum (15.15%), pigeonpea + groundnut (22.26%) and pigeonpea + blackgram (20.49%) intercropping systems. These effective cropping systems registered highest pigeonpea equivalent yields that was in the range of 0.97-1.11 tonnes/ha. Further these systems were more efficient agronomically in terms of land equivalent ratio (1.04-1.31), aggressivity (1.03-1.49), competitive ratio (1.77-1.97) and relative crowding coefficient (4.08 - 9.59). Economic analysis showed these intercropping systems to be more profitable than the sole pigeonpea.
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Date 2021-08-25T04:43:35Z
2021-08-25T04:43:35Z
2007
 
Type Research Paper
 
Identifier 77(7):495-501.
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http://krishi.icar.gov.in/jspui/handle/123456789/60447
 
Language English
 
Relation Not Available;
 
Publisher Indian Journal of Agricultural sciences