Oviposition season of chestnut weevil (Curculio sikkimensis) and its control with peach moth (Conogethes punctiferalis) on the chestnut [Castanea crenata] cultivation
2008
Kanazaki, S.(Ehime-ken. Fruit Tree Experiment Station, Matsuyama (Japan)) | Ii, Y.
Oviposition season of chestnut weevil (Curculio sikkimensis (Heller)) was examined at the commercial field of chestnut orchard in Iyo-shi, Ehime Prefecture. In addition, simultaneous control method of the weevil with peach moth (Conogethes punctiferalis (Guenee)), which infests at the same season was investigated. 1) Oviposition season of the weevil was presumed from the beginning to the middle of September on medium maturing cultivar, 'Tukuba', and from the middle to the end of September on late maturing cultivar, 'Isizuchi', though these were movable depend on the climate condition. As the results, the optimum timing for controlling the weevil by the pesticides was thought to be the first half of September in Ehime Prefecture. 2) For simultaneous control of chestnut weevil and peach moth, spray of 600 l/10a of Fenvalerate 10%+MEP 30% wettable powder (1,000-fold dilution) was the best method. However, when the target is limited to chestnut weevil, it is effective enough to spray same amount of 2,000-fold dilution of the same chemicals. On the other hand, when the target is limited to peach moth, it is effective enough only to spray a half amount (300 l/10a) of 1,000-fold dilution of the same chemicals.
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