Harmfulness of mirid bugs (Heteroptera, Miridae) on hop plants
1999
Sedivy, J. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic)) | Fric, V.
Mirid bugs in a high density were registered in some hop-yards in Czech Republic in 1998. Harmful occurrence is usual in the years with higher temperature and length of sunshine connected with lower precipitation in the period from October to May. Mirid bugs cause the damage to hop veins, leaves and inflorescence. Vegetative cones are the organs which are the most sensitive to mirid bugs. The symptoms of the damage are as follows: distortion, wilting and top drying. The most common species inside those hop-yards and in their nearest vicinity are the polyphagous ones: Lygus kalmi, Lygus rugulipennis, Lygocoris lucorum, Liocoris tripustulatus, Calocoris fulvomaculatus and Calocoris norvegicus. The yield of hop cones obtained from damaged plants was lower by 50.1% in the average per one hop plant in the comparison with undamaged plants.
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