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Application of Mycotrol and Naturalis-L for management of Bemisia argentifolii on vegetables, cotton and ornamentals in southern United States

, : Application of Mycotrol and Naturalis-L for management of Bemisia argentifolii on vegetables, cotton and ornamentals in southern United States. Subtropical Plant Science 51: 41-48

Two different strains of Beauveria bassiana (Balsamo) Vuillemin, formulated as Mycotrol(R) and Naturalis-L(R), were tested against Bemisia argentifolii Bellows and Perring in Arizona, California, Florida, and Texas. Laboratory bioassays, greenhouse and field experiments were conducted on hibiscus, sweetpotato, cantaloupe, cucumber, tomato, eggplants and cotton. Mycotrol caused 76-94% mortality of B. argentifolii nymphs under laboratory and greenhouse conditions, where relative humidity was maintained above 90%. In Arizona, on subsurface drip irrigated cantaloupe that was under moderate to light whitefly pressure, Mycotrol provided significant control of whitefly with 68-79% population reduction, whereas Naturalis-L did not. After 3 applications at the labeled rate (1.12 kg/ha), Mycotrol had the cumulative effect of maintaining adult whitefly populations below the economic threshold of 3 per leaf for 28 d after the initial treatment. In the Imperial Valley, California, on cotton and in southwest Florida on field tomato and eggplant, multiple applications of Mycotrol at weekly intervals did not reduce whitefly population compared with untreated control. Naturalis-L was effective against B. argentifolii under laboratory conditions, and provided fairly good control on cotton in southern Texas, but did not give sufficient control on cucumber in south Texas or on cantaloupe in Arizona. It appears that applications of B. bassiana products, i.e. Mycotrol and Naturalis-L, could play a role in whitefly management, although their usefulness may be limited to high humidity conditions and complete spray coverage.


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