京都府船井郡京丹波町のダイズ栽培圃場において採集したホソヘリカメムシ成虫の腸管切片および糞を観察した。腸管および糞にはE. coryli の子嚢胞子および酵母体ならびに，E. ashbyi の子嚢胞子が観察された。Dalmauplate培養^2）ではE. coryli 酵母体の出芽および増殖ならびに，E. ashbyi の子嚢胞子の発芽および菌糸の伸長を観察したが，E. coryli の子嚢胞子は発芽しなかった。これらの結果は，E. coryli およびE. ashbyi が腸管内でも生存し，糞中へ生存したまま排出されることを示した。

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ヒノキ球果の食害度の違いがチャバネアオカメムシの増殖に及ぼす影響を明らかにするために，口針鞘数の多い球果（HDC）または少ない球果（SDC）を与えて，チャバネアオカメムシの産卵数と幼虫生存率を調べた。産卵数は，SDCに比べてHDCでは非常に少なく，産卵が抑制された。SDCでは，幼虫の生存率が高く，90％以上の個体が羽化したが，HDCでは5齢幼虫での死亡率が高く，羽化率は23％まで低下した。また前胸背幅でみた羽化成虫の体サイズは，雄雌ともにSDCでは大きく，HDCでは小さかった。これらの結果は，ヒノキ球果の餌条件悪化がチャバネアオカメムシの増殖を大きく抑制することを示唆した。

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施設栽培した甘長トウガラシCapsicum annum (品種伏見甘長とうがらし)を用いて，農薬(ブプロフェジン・フェンピロキシメート混合水和剤)の作物残留量からドリフトの影響をみた。１週間おきの３回散布１日後の調査から，施設内の非散布区の作物に薬剤が残留していることが明らかとなった。また，非散布区の，残留量と散布区からの距離の関係は，最小二乗法の累乗近似で予想することが可能であった。

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The effect on control of Physalophora canker on shoots of Japanese pear by shaving to remove fungal warts or the applica-tion of fungicides was investigated in a long-term field experiment during 1991-1996. In 1991, diseased shoots each with 60 warts of Physalospora canker were placed on healthy trees 2 years old growing outdoors without the application of fungicides during March-November. As a result of this inoculation, shoots of the current year, which grew from 1991 onwards, displayed many warts from the first year after inoculation, and 2-year old shoots displayed many warts from the second year after inoculation. The diseased warts were shaved off in December every year during 1991-1996, while fungicide treatments were sprayed 13 times every growing season from 1992 to 1994. However, no fungicides at all were applied during 1995-1996. Shaving off warts reduced the occur-rence of warts the following year by half, but warts occurred for at least 5 years after the initial removal was carried out. However the application of fungicides that were effective against Physalospora canker, at 13 sprays a year, completely stopped the occurrence of warts on every shoot. The current year's growth in 1995 and 1996 displayed few warts. Shoots that were 2-4 years old, in which the lignification was finished, showed few warts from the second year after spraying had stopped. From these results, it was concluded that the application of fungicides that were effective against Physalospora canker, with 13 sprays a year a season, had a protective effect not only for current shoots, but also for shoots in which lignification had finished. And it would be more effective to paint a thiophanate-methyl paste onto the surface of the injured parts after shaving warts from shoots in which lignification had finished.

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The effect of fruit shape on the incidence of core rot caused by Phomopsis sp. in Japanese pear cv. ‘ Kosui’ was investigated in 3 field experiments during 1999-2000. One finding was that fruit where the diameter of the calyx tube at harvest was bigger than 1 mm had an incidence of core rot twice (41.3%) as high as fruit (22.1%) with a tube diameter smaller than 1 mm. Moreover the rate in fruit with a calyx hole bigger than 1mm when measured 52 days after full bloom stage was remarkably higher for flattened fruit compared to those with an oval shape. I estimated that it would be possible to greatly reduce the incidence of core rot if flattened fruit were selectively removed within 2 months after full bloom stage.

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When a water solution of the insecticide dinotefuran was applied to cabbage seedlings in the cell-trays just before transplanting them, the occurrence of Thrips tabaci on cabbage plants in the field was suppressed effectively for at least two weeks.

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