Influence of insect and seed densities and heat treatment on the infestation of Callosobruchus chinensis (L.) on mungbean [Vigna radiata (L.) Wilczek].
1990
Buctuanon E.M.
A study was conducted to determine the influence of different insect and seed densities and heat treatment on the infestation of bean weevil, Callosobruchus chinensis on mungbean. Insect and seed densities as well as varieties/genotype had significant influence in obtaining large responses in the number of eggs and progenies of the bean weevil. Based on the experimental results, use of at least 10 adult weevils to infest test samples containing at least 40 seeds for a 5-day oviposition period should produce reliable results when infesting mungbean seeds with unsexed weevils. These results however, have limitations because weevils used were not sexed. A further study therefore is recommended and comparison of results can be done later. Dry heat treatment was very effective in disinfecting mungbean seeds from the bean weevil in different developmental stages. It improved germination depending upon the condition of the seed before treatment and certain temperature limits. A suggested treatment for mungbean disinfection using dry heat would be 60 deg C and 70 deg C for two- and one-hour treatments, respectively at 12% moisture content. For seeds in bulk, 60 deg C is much preferred. Dry heat can also be a very effective method of insect control in storage particularly with the bean weevil in mungbean.
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