Suppressing effect of different botanicals on the adzuki bean beetle (Callosobruchus chinensis L.).
1996
Bayeh Mulatu | Tadese Gebremedhin
Seven different plant species with known biocidal effect had been evaluated for two years in Holetta Research Center using incubator to find alternatives for pirimiphos methyl 2 percent. All the botanicals were used as powders except neem and "birbira" which were also used by either extracting the oil out of their seeds. The products were used at the rate of 50 mg, 100 mg, and 150 mg/ml per 100 gm of faba bean seed. Botanical treated seeds plus Pirimiphos-methyl treated and traditional checks were put in small ventilated cages into which were added five pairs of newly emerged adults of the insect per cage. All the cages were then put in the incubator replicated thrice. Data were collected on number of eggs laid fifteen days after emergence, adults emerged (live and dead), seeds clean, with egg and seeds with hole. The data were analyzed using Mstat statistical package by transforming the count data into log 10 (n + 1). The results showed that neem and birbira oil and pyrethrum flower powder gave best control of the beetle with log transformed value for the total number of eggs laid at the lowest rate of the three botanicals being 0.30, 0.30 and 0.21 respectively. However, none of the laid eggs survived. For the kernel oils, the minimum rates were even found too much requiring the study on lower rates than 0.5 gm/100 seed.
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