Effect of carbofuran insecticide on growth and yields of Thai supersweet composite 1 DMR sweet corn (Zea mays L. var. saccharata Bailey).
1991
Somsak Siriphontangmun
Different rates of carbofuran 3G tested had some significant effect on the growth of corn, especially at the rate of 1.0 g/hill. At such rate the best growth development was obtained in comparison with control with the following averages: the plant heights were 275.20 and 260.42 cm; the number of leaves was 14.38 and 13.8 leaves/plant; the leaf areas were 443.41 and 370.26 square cm/plant, the 50 % tasselling and silking days were 46.25 and 51 and 51 and 57.5 days; the first and second ear heights were 121.65 and 104.84 and 106.75 and 96.88 cm, the dry matters were 247.86 and 228.49 g/plant and the crop growth rates were 5.76 and 4.40 g/day/plant when the corn was ten weeks old respectively. The effect of carbofuran 3G on the yield and yield components were also similar. At the rate of 10 g/hill, highest yield and yield components comparing with control gave the following averages: the number of ears was 2.038 and 1.988 ears/plant; the ear lengths were 23.12 and 20.82 cm; the ear girths were 15.86 and 13.82 cm; the ear weights were 263.41 and 231.11 g; and the yields were 4579.68 and 3919.51 kg/rai respectively. Ostrinia furnacalis Guenee (Lepidoptera : Pyralidae), Rhapalosiphum maidis Fitch (Homoptera : Aphididae), Frankliniella williamsi Houd (Thysanoptera : Thripidae), Adoretus compressus Web (Coleoptera : Scarabaidae) were found to attack corn plant throughout the experiment. The natural enemies found were Proreus similans Strallen (Dermaptera : Chelisochidae), Menochilus sexmaculatus Fitch (Coleoptera : Coccinellidae) and Vespa sp. (Hymenoptera : Vespidae). Their population density did not seem to differ on corn treated with different rates of carbofuran.
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