Influence of plant densities on corn borer, Ostrinia furnacalis (Guenee), incidence [Philippines]
1986
Malihan, O.D.
No significant differences in the number of egg mass was observed among various levels of plant density. A non-linear relationship between entrance hole and plant density was observed at dough stage. Plant densities of 40,039 and 80,079 plants per hectare consistently had the highest number of entrance holes. Both extreme low (26,666 plants/ha) and high (106,666 plants/ha) plant populations, on the other hand, had the lowest entrance hole count. There were no significant differences in the number of entrance holes between HyCorn 9 and IPB Var 1. A high positive linear relationship was noted between tunnel count at harvest and plant density during the dry season. It was shown that 40,039 and 80,079 plants per hectare had the highest tunnel count. Generally, yield per plant decreased with increasing plant density. The reverse trend was observed in terms of yield per hectare. There was a positive linear relationship between cross-sectional area of tunnels with plant density. It was also observed that tunnel area wider than 37 mm2 resulted to a decrease in yield
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