To evaluate conservation biological control utilizing indigenous natural enemies Scolothrips takahashii Priesner against Tetranychus urticae Koch on strawberry during the nursery period, we investigated the seasonal occurrence of the spider mite and their natural enemies on strawberry potted plants in agricultural fields to which selective insecticides had been sprayed during 2012-2014. Then we also examined the spider mite control effect of the conservation of S. takahashii by using selective pesticide （treatment） in comparison with the non-selective pesticide control method which excludes the predator （control） in an experimental field. In the agricultural field studies, S. takahashii was the only natural enemy observed on strawberry potted plants while the spider mite density was low in all fields in each year. Meanwhile in the experimental field, the number of spider mites in the S. takahashii conservation treatment was significantly lower than that in the control （repeated measures ANOVA, P＜0.001） by the conservation of S. takahashii. These results suggest that S. takahashii was an effective control agent against the spider mite, and could contribute to the development of IPM for strawberry during the nursery period.
Species composition and its seasonal changes of parasitoids against leafminer flies, Chromatomyia horticola and Liriomyza trifolii, were surveyed in fields where snap pea, Pisum sativum, and broad bean, Vicia faba, were cultivated in Ibusuki City, Kagoshima Prefecture from October 2015 to March 2016. Noted parasitoids were seven species against C. horticola and six species against Liriomyza trifolii, respectively. The dominant species were Diglyphus isaea, Hemiptarsenus varicornis and Opius spp. against C. horticola. Furthermore, Neochrysocharis formosa was added to aforementioned three parasitoids against Liriomyza trifolii. Parasitoids’ species composition changed with season, ratio of Diglyphus isaea and Opius spp. increased in the cold season（ from December to February）, suggesting that thermal suitability of the parasitoids may affect its occurrence.
The attractiveness of incandescent lamp （54W） and mercury lamp （100W） light sources to stink bugs （Heteroptera: Pentatomidae） was compared under field conditions. Although the degree of the attractive effect differed among stink bug species, 5.6–304.6 times as many bugs were caught in the mercury lamp trap than in the incandescent lamp trap. The total photon numbers in the spectral sensitivity region for stink bugs （250–650nm） were almost the same between the two lamps; however, the mercury lamp emitted about 16 times more photons than the incandescent lamp in the ultraviolet region （250–400nm）, which is highly attractive to stink bugs. When the mercury lamp was covered with a UV-absorbing filter, which blocked about 90% of the photons in the ultraviolet region, the numbers of trapped Glaucias subpunctatus （Walker）, Plautia stali Scott, and Halyomorpha halys（Stål） decreased to less than 25% of those trapped using the non-filtered mercury lamp. These results indicate that the high attractiveness of the mercury lamp to some stink bug species is partly due to strong light intensity in the ultraviolet region.
Scirtothrips dorsalis is known as a pest in mango. Strain C and YT of S. dorsalis coexisted on mango in Kagoshima Prefecture. We investigated the overwintering sites of S. dorsalis in mango under plastic house conditions. Strain YT caught by yellow sticky traps and ground traps were observed at a minimum level of activity for four months from November to late February, so they seemed to overwinter in mango. On the other hand, strain C was observed from a number of adults caught by the traps from October to November, after that they increased until spring. This result establishes strain C seemed to active in mango throughout autumn-winter. Strain C was also observed in flower buds of mango that were not caught by the yellow sticky traps. This result suggests that strain C propagated and emerged from buds throughout the autumn-winter.