Proceedings of the Fifth Asian Regional Maize Workshop - Search ...
Proceedings of the Fifth Asian Regional Maize Workshop - Search ...
Proceedings of the Fifth Asian Regional Maize Workshop - Search ...
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Table 6. Density <strong>of</strong> corn borer egg masses, and percent parasitism <strong>of</strong> egg masses in field corn<br />
production areas with integrated or conventional control .!I.<br />
1985 1986 1987 1988<br />
Control Spring crop Fall crop Spr in. crop fall crop Sprin. crop fall crop Spr in~ crop<br />
""thod .rNa. eu .YEn ~o.••• E•• No. eu Eu !o.•u E•• ~o. eu E•• No .••• Eg No.•u Eu<br />
lasses parasitisa aasses parasit isa .asses paras it iSI . IIsses parasitisl laSses paras it iSI ..sses paruitisl lasses paras it iSI<br />
/plt (S) /plt (S) /plt (~) /plt (S) /plt (S) /plt (S) /plt (S)<br />
--------------------<br />
Inturated!' 2.7i 18.0& 1.3& 22.0a I.Sa 10.2a 4.0 b 14.0a 1.8a 12.10 1.5. 13.4. 3.6. 26.3a<br />
Co.'entionatH 3.0. 5.0 b 1.8. 6.0 b 2.4. 2.0 b 7.8. 3.5 b 2.2. 1.5 b 2.2. 2.2 b 3.0. 6.5 b<br />
Within a column, means followed by same letter do not differ significantly at 0.05% probability<br />
level (DMRT).<br />
Four releases <strong>of</strong> T. ostriniae each 75 egg cards/ha combined with 3 insecticide treatments.<br />
Insecticide treatments applied from early whorl to pollen-shedding stage at an interval<br />
<strong>of</strong> 7-10 days.<br />
Table 7.<br />
borer }j.<br />
Grain yield <strong>of</strong> field corn with integrated or conventional control <strong>of</strong> corn<br />
1985 1986 1987 1988<br />
---------------_. ----------------- ----------------- ---------<br />
Control Spring Fall Spring Fall Spring Fall Spring Average Index<br />
method crop crop crop crop crop crop crop<br />
(kg/ha) (kg/ha) (kg/ha) (kg/ha) (kg/ha) (kg/ha) (kg/ha) (kg/ha) (%)<br />
Integrated "f:../ 3,708 4,503 3,869 4,561 4,085 4,396 4,557 4,240 b 111<br />
Conventional l/ 3,405 4,087 3,543 3,867 3,854 3,890 4,078 3,818 a 100<br />
11 In <strong>the</strong> same column, means followed by <strong>the</strong> same letter do not differ significantly at 0.05%<br />
probability level (DMRT).<br />
~ Sarne as in Table 6.<br />
~ Same as in Table 6.<br />
References<br />
Awadallah, W.H. 1983. The development and vse <strong>of</strong> varietal resistance and o<strong>the</strong>r nonchemical<br />
control methods to reduce yield losses due to stalk borers in maize. FG-E9-170 (EG-ARS<br />
52). Final report.<br />
Chen, K.P., and Chur L.S. 1948. The metods for artificially and massively releasing Trichogramma<br />
austra7icum Girault for controlling <strong>the</strong> sugar cane borers. Rept. <strong>of</strong> <strong>the</strong> Taiwan Sugar Res.<br />
Inst. 2: 21-36.<br />
Chona, B. JL. and M.L. Seth. 1960. A mosaic disease <strong>of</strong> maize (Zea mays L.) in India. Indian J.<br />
Agric. Sci. 30: 25-32.<br />
127
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