Field trials of Metarhizium anisopliae var. acridum (Ascomycota: Hypocreales) against oriental migratory locusts, Locusta migratoria manilensis (Meyen) in Northern China


发布时间:

2020-07-13

Field trials of Metarhizium anisopliae var. acridum (Ascomycota: Hypocreales)
against oriental migratory locusts, Locusta migratoria manilensis (Meyen) in
Northern China
 
Crop Protection
 
During 2002–2006, nymph bands of Locusta migratoria manilensis (Meyen) were treated by ground and aerial applications in 6000 ha of grasslands and the nearby beach of Yellow river using a soybean oil miscible suspension ULV formulation of Metarhizium anisopliae var. acridum isolate CQMa102. The formulation was also applied in Tianjin. Henan, Hebei, Shandong and Shanxi provinces of Northern China by ground and aerial applications. During fifield studies, cage tests were carried out in corresponding fifield plots in order to estimate the mortality accurately. Doses of 3.3 1012and5.0 1012 conidia ha1 were equally effective and caused 90% mortality 9–13 days after treatment. In the
ground spray trial, 3.3 1012 conidia ha1killed 490% of L. migratoria manilensis 11–15 days aftertreatment in a wide variety of vegetation and weather conditions. The decline of locust populations was slower where vegetation was taller and denser. In the aerial spray treatment, the fifinal percent survival of locusts was lowered to 10% at 11 and 14 days in the fifield cage and open fifield locusts, respectively.Furthermore, the M. anisopliae oil miscible suspension formulation did not appear to harm natural enemies of locusts in the fifield.
 
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