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Effect of Eichhornia leaf powder on larval mortality and emergence of Collosobruchus maculatus (Fab.) infesting Gram

Ravindra Kumar Sharma*, Randheer Kumar & O.P. Singh
Entomology Research Laboratory,
B.R.A. Bihar University, Muzaffarpur, – 842001 India

Received 7th May, 2008 ; Revised 30th August, 2008

Abstract: 100 gms of gram were taken in different glass tubes of 6”x 2” sizes. Larvae of Collosobruchus maculatus were picked up after carefully breaking the grain, with the help of a soft brush. 10 larvae were transferred to the glass tubes containing gram treated with different doses of the leaf powder. Four doses (0.5 gm, 1 gm, 1.5 gm & 2 gms) were used for such treatment. Simultaneously three replicates with untreated grain were established as control. The room temperature was at 34°C + 2°C with humidity 30 to 40%. All experiments were carried out on equal degree of ventilation. The observation on the larval development was quite effective in reducing the number of larvae and delayed emergence.

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