Studies on the Feeding Habits of Lygus disponsi LINNAVUORI(Hemiptera : Miridae) and the Injury to its Host Plants : I. Histological Observations of the Injury

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The present stusy was performed as a part of the investigation on the mechanism of the injury inflicted by L. disponsi on its host plants. The stylets of the bug entered the plant tissue inter- or intra-cellularly at random. Though no stylet sheath was formed along the stylet track, there were left hemalaun-staining microgranular substances. In the case of sugar beet, the feeding area was generally localized within the intrafascicular cambium in the petiole and leaf vein, while in the case of rape, the bug fed on various tissues, but in either case the tissues on which it was found of feeding were young growing ones. A cavity surrounded by a brown-colored layer was formed in the feeding area. The causes of the malformation in sugar beet plant were discussed.