夏播き飼料用作物に対するフタテンチビヨコバイ加害の影響

概要

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Maize wallaby ear symptom (MWES) is caused by the maize orange leafhopper Cicadulina bipunctata, which feeds on various Poaceae plants. We examined the effects of C. bipunctata infestation on 6 summer-seeding forage crops. Swelling of leaf veins, which is the characteristic symptom of MWES, was not observed in infested plants of the orchard grass Dactylis glomerata, sorghum Sorghum bicolor, Rhodes grass Chloris gayana, Sudan grass Sorghum sudanense, and guinea grass Panicum maximum, although significant growth suppression occurred in the orchard grass and Rhodes grass. However, strong growth suppression and severe swelling of leaf veins was observed in all varieties of the oats Avena sativa and A. strigosa that were infested by C. bipunctata, indicating that MWES could occur in oats as well as in the maize Zea mays. Both adult and nymph C. bipunctata individuals could feed on orchard grass, sorghum, Sudan grass, and oats, indicating that these 4 crops could be the host plants of C. bipunctata. Because MWES clearly affected oats but not the other 3 crops, it seems that development of MWES on feeding plants is not indispensable for the survival of C. bipunctata.
九州病害虫研究会の論文