Phacelia tanacetifoliaBentham is known worldwide as a kind of insectary plant and is used in Japan as a green manure crop before Welsh onion planting. To explore the possibility of using P. tanacetifolia as a banker plant or an insectary plant for parasitoids of Liriomyza chinensis Kato, we investigated the seasonal abundance of agromyzid leafminers and their hymenopterous parasitoids on infested leaves and blooming flowers of P. tanacetifolia collected in Chiba Pref., Japan, in 2009Japan, in , 2010Japan, in , and 2012. We also investigated longevity increase in Diglyphus isaea Walker adults with a blooming P. tanacetifolia plant in the laboratory. Almost all agromyzid leafminers reared from leaves were Chromatomyia horticola Goureau . Twenty-one parasitoid species including seven species reported from L. chinensis mines by different authors in Japan were reared from leaves, and nine species including eight species reared from leaves were caught on flowers. The most abundant parasitoid species was D. isaea. In this study, Diglyphus crassinervis Erdös was reared from C. horticola for the first time in Japan. The longevity of D. isaea adults provided with a blooming plant and water was about 18 days at 24 C with a 16L : 8D photoperiod. The log-rank test, used to compare survival curves from the 2 treatments; with and without blooming P. tanacetifolia plant, showed a statistically significant difference between treatments. These results suggest that P. tanacetifolia has potential as a banker plant or insectary plant for parasitoids to control L. chinensis in Welsh onion fields.

We investigated the effects of abiotic environmental factors on spring flight initiation of Scirtothrips dorsalis Hood(Thysanoptera: Thripidae )by monitoring the number of its overwintered adults captured by yellow sticky traps in a Japanese pear orchard from 2012 to 2015. More S. dorsalis were captured on sticky traps placed at 50 cm above ground level in the plot where pear trees were dense than in the plot where trees were sparse, which suggests that many adults overwintered inside of pear orchards. More S. dorsalis were captured on traps placed at 50 cm above ground level than at 200 cm above, which suggests that sticky traps at 50 cm above ground level were suitable for monitoring the overwintered generation of S. dorsalis. A logistic regression analysis revealed that the capture probability(Pc )of overwintered adults was positively correlated with the daily maximum temperature and the hours of sunlight, and negatively correlated with the daily mean wind speed. More than 99% of S. dorsalis were captured when the maximum temperature exceeded 17.5 C, the mean wind speed was ≤ 2.7 m/s, or sunlight was ≥ 3.7 h/d. The date of peak capture of overwintered S. dorsalis could be estimated more accurately from the total effective temperature calculated from January 1 combined with the Pc value than from the total effective temperature alone.