Management of Harmful Mordellidae (Coleoptera: Mordellidae) in Hemp Crops of the Left-Bank Forest-Steppe of Ukraine
Keywords:
agrocenosis, insects, phytophages, insecticides, efficiencyAbstract
Protection of agricultural crops from harmful organisms is an important component in the plant production system, a significant reserve for increasing plant productivity and improvement of crop quality. Today, along with specialized species of phytophages, insects from the Mordellidae family are increasingly harmful in hemp crops, which is dangerous due to the biology of hemp and the hidden lifestyle of the harmful larval stage of these insects. The purpose of the research is to determine the effectiveness of biological and chemical insecticides against insect phytophages of the Mordellidae family in hemp crops. The species composition of harmful tumbling flower beetles (Mordellidae) in the hemp agrocenosis of the Left-Bank Forest-Steppe of Ukraine was represented by three species – Mordellistena parvula Gyll. (4.72%), M. connata Erm. (0.58%) and M. variegata Fabr. (0.03%) with a total share in the harmful entomocomplex of 5.33%. The highest effectiveness of insecticidal protection of hemp from Mordellidae was provided by the double application of chemicals Voliam flexi 300, SC (0.3 l/ha) and Coragen 20, SC (0.2 l/ha), which had the best technical efficiency (81.4% and 79.4% in the phenophase «fullу ripe, beginning of fruit abscission» (BBCH 89), respectively) and economic efficiency (seed yield reached 1.73 t/ha, straw yield – 4.20 t/ha and 1.71 t/ha and 4.13 t/ha) due to the long- term protective action.
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