Studies on integrated pest management system in tea [Camellia sinensis] fields, 2: The influence of sprouting times of tea and peak pheromone trap catches of the tea leafroller, Caloptilia theivora Walsingham, on damage levels
2004
Isobe, K. (Mie-ken. Science and Technology Promotion Center, Ureshino (Japan). Agricultural Research Division) | Matugatani, Y.
Abstract In 1997 and 1999, the number of leaves damaged by 5th instar lavae of the tea leafroller was examined in tea field with different first plucking times of sprouted tea leaves. The number of damaged leaves was fewer leaves than 50/square m, tolerable injury level, if when peak trap catches of over wintered generation adults of the tea leafroller occurred at the same time as or earlier than sprouting times for the first crop. However, when peak trap catches occurred latter than sprouting times for the first crop, damage by tea leafrollers exceeded a tolerable injury - leve 1. These results suggest that monitoring of trap caches and sprouting times of tea is effective method for judging whether or not chemicals should be applied to control tea leafrollers for the first crop of tea leaf.
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