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  • Oviposition site and egg mortality of the armyworm, Pseudaletia separata WALKER, on orchardgrass.
  • アワヨトウ ノ ボクソウ ヘ ノ サンラン

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The oviposition site on orchardgrass of the armyworm, Pseudaletia separata WALKER, changed with the regrowth of grass after harvest. A lager number of eggs was laid on dead leaves than on living leaves on the day after harvest and about 40 days latter, but the situation was reversed about 20 days after harvest when the grass was regrowing rapidly. The greater part of the eggs was laid within the folds of unexpanded living leaves and dead leaves. After living leaves expanded, 21.9-88.3% of the eggs laid on them became exposed. No eggs on dead leaves were exposed until egg hatching. When eggs laid on dead leaves were placed on the ground in the grassland, the exposed eggs suffered a heavy mortality, while the eggs concealed within folded leaves were more viable due to protection. The mortality of the eggs which were attached to leaves at different heights above ground decreased in the order of 0, 15, 30cm. Among the egg predators concerned, an ant, Pheidole fervida SMITH, predominated over others in all the seasons tested. These results suggest that the oviposition preference of crevices by the female armyworm moths may play a role in their escaping from the attack of egg predators, especially when they laid eggs within folds of dead leaves.

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