Effect of pesticide application on fertilization of cashew flowers
1993
Hempaiboon, I. | Sriphukdee, U. | Wanachit, W. (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Natural Resources. Dept. of Plant Science)
Study on the effect of pesticide application on fertilization of cashew flowers was conducted by using a fungicide; benomyl (Benlate 50 percent WP.) and an insecticide; carbaryl (Sevin 85 percent WP). Different concentrations of the chemicals were sprayed onto the pollinated cashew flowers, before and after pollination. The fertilizations were examined by using staining technique incorporated with inflorescent microscopy at 48 hr after the sprays. The results showed that Benlate 16 g/20 l of water and Sevin 30 g/20 1 of water completely inhibited fertilization of cashew flowers and these concentrations were lower than that of the general recommended doses. When timing of the chemical application was investigated, Benlate 10 g/20 l of water and Sevin 5 g/20 1 of water spraysed onto the flowers just before and after pollination had a serious effect to ferillization when compared with the applications at 3 hr after pollination. It is indicated that application times of the chemical should be concerning to natural pollonation period, fertilization, and safe of the users.
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