ENTOMOFAUNA OF HETEROPTERA ORDER IN ALFALFA FORAGE | Хетероптерна ентомофауна при люцерна за фураж
2012
Nikolova, I., Institute of Forage Crops, Pleven (Bulgaria)
During the period 2006-2009 has been studied entomofauna of heteroptera order in alfalfa to correctly determine the time to combat. The species of the order Heteroptera in lucerne crops were represented by 39 species of bugs, including 28 phytophagous and 11 predatory. Phytophagous species belong to 8 families and 21 genera, and predators - to 5 families and 6 genera. Serious and dominant pest were Adelphocoris lineolatus (29.7%) and Lygus rugulipennis (19.1%), and subdominant species was Piezodorus literatus (5.2%). Harmful bugs were found in the highest number in the flowering stage of second and third regrowth respectively in the second decade of June and the second half of July. To useful bugs belonged species of the family Nabidae - genus Nabis (10.7%), and from family Anthocoridae - Orius niger (4.8%). Their population dynamics followed or correspond of dynamics of harmful bugs, underlining their role as agents. In the cultivation of alfalfa forage appropriate period to combat with harmful bugs exceeding economic threshold of harmfulness is stage of button of the second and third regrowth with appropriate insecticides.
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