STUDIES ON THE CONTROL OF GRAM POD BORER heliothis armigera (Hubner) BY INSECTICIDAL AND BIO-CONTROL METHODS IN PIGEONPEA ( Cajanus cajan (L.) Millsp.)
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Title |
STUDIES ON THE CONTROL OF GRAM POD BORER heliothis armigera (Hubner) BY INSECTICIDAL AND BIO-CONTROL METHODS IN PIGEONPEA ( Cajanus cajan (L.) Millsp.)
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Creator |
VIRUPAKSHAIAH, G
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Contributor |
Kameswara Rao, P
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Subject |
STUDIES,CONTROL, GRAM, POD, BORER, INSECTICIDAL,BIO-CONTROL, METHODS, PIGEONPEA
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Description |
A field experiment was laid out in Kharif 1988-89 for the control of gram caterpillar, Heliothis armiaera Hubner on pigeonpea crop with fourteen treytments viz., (1} Nuclear polyhedrosis virus (NPV) 250 LE ha- (2) NPV 125 LE ha-l plus monocrotophos 0.025 per cent (3) monocrotophos 0.05 per cent (4) Bacillus thurinaiensis ( B.t. ) 2 g L- 1 (5) B.t. 2 g L- 1 plus fenvalerate 0. 05 per cent (6) Cartap 1.5 g ~1 (7) Cartap 1.5 g L-1 plus fenvalerate 0.005 per cent. (8) fenvalerate 0.01 per cent (9) fenvalerate 0.4 per cent dust ·(10) diflubenzuron 0.05 per cent (11) diflubenzuron 0.05 per cent plus fenvalerate o.oos per cent (12) Alletin 0.2 per cent (13) Alletin 0.2 per cent plus monocrotophos 0.05 per cent and (14) control. The maximum per cent larval reduction was obtained with fenvalerate 0.4 per cent dust (95.84) while the least reduction was obtained with cartap 1.5 g L-l (28.76). The lowest per cent pod damage (9.35) and grain damage (10.85) were obtained with fenvalerate 0.4 per cent dust while the maximum per cent pod damage (28.39) and grain damage (23.16) were recorded by cartap 1.5 g L-1 as against 37.61 and 28.73 per cent respectively in the control. The maximum grain yield was obtained with fenvalerate 0.4 per cent dust (14.20 q ha-1) and minimum yield with cartap 1.5 g L-l (5.45 q ha-1) as against 4.4 q ha-l in the control. The highest cost benefit ratio was obtained.with fenvalerate 0.01 per cent (1:11.37) followed by monocrotophos 0.05 per cent (1:5.82). In the present studies synthetic pyrethroids proved to be effective in controlling ~· armigera and giving higher yiela~· In the seasonal incidence studies the pi~eonpea pod borers viz., tl• armilera, ~· testulalis and E. atomosa were observed in the fie d from November to January. The peak activity of pod borers was observed in the month of December. In the pheromone trap catches of ~· armigera the moth catches were observed to be significant positively correlated to the number of eggs (r • +0.888) in field. In case of larval population, the larval population in relation to trap catches was positive but nonsignificant (r • +0.621). |
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Date |
2016-08-18T14:17:21Z
2016-08-18T14:17:21Z 1989 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/72908
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Language |
en
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Relation |
D3413;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.
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