Interaction between the entomopathogenic fungus, Beauveria bassiana and some insecticides against the whitefly, Bemisia tabaci (genn.) (Homoptera: Aleyrodidae)
Ibrahim, A. A.
Interaction between the entomopathogenic fungus, Beauveria bassiana and some insecticides against the whitefly, Bemisia tabaci (genn.) (Homoptera: Aleyrodidae) [electronic resource]. - P.41-48
Includes reference.
n vitro inhibition of 4 different insecticides Cord, Imaxi, Orizon and Achook on the entomopathogenic fungus,Beauveria bassiana growth was tested. Three concentrations of each insecticide; recommended, half and 1\4 of recommended concentrates (Rc) were used. There was no inhibition of mycelial growth with Imaxi at the three concentrates. On the other hand, Orizon and Achook had the same effect (100%) at 1/2RC and 1/4RC, but at RC it exhibited 50% mycelial growth. However Cord exhibited 50% mycelial growth at both RC and 1I2RC, while at 1/4RC mycelial growth was approximate 75%. In addition, the efficacy of tested combinations (Biovar plus each of Cord, Imaxi, Orizon and Achook) was evaluated under greenhouse conditions on cucumber against the whitefly, Bemesia tabaci (Genn.) at the recommended and half recommended rates. The combinations of the bioinsecticide: Biovar 4% WP at recommended concentration, (200 gm/l00 L.) plus Imaxi 35%EC at its half recommended rate 1/2RC (37.5 cm³/lOOL.); Biovar 4% WP at its RC plus Orizon 11%EC at its ~C (25 cm3/looL.) and Biovar 4% WP at its RC plus Achook 0.15%EC at its 1/2RC (93.7/100L.) achieved significant control of the whitefly, B. tabaci by decreasing the application rates of pesticides and obtaining good protection with less residuals. Also, the co-toxicity resulted from adding the Biovar to the Cord induced an irregular joint action against B. tabaci stages and resulted in dominated antagonistic effect. An additive effect was dominated in case of the addition of Biovar to Imaxi, Orizon and Achook by which the total mortality was higher than the mortality of summation of each compound separately. Thus, the joint action of two compounds in the mixtures was more effective against the tested insect than each compound alone.
Aleyrodidae.
Insecticides.
Entomopathogenic fungi.
Bemisia tabaci.
Beauveria bassiana.
Interaction between the entomopathogenic fungus, Beauveria bassiana and some insecticides against the whitefly, Bemisia tabaci (genn.) (Homoptera: Aleyrodidae) [electronic resource]. - P.41-48
Includes reference.
n vitro inhibition of 4 different insecticides Cord, Imaxi, Orizon and Achook on the entomopathogenic fungus,Beauveria bassiana growth was tested. Three concentrations of each insecticide; recommended, half and 1\4 of recommended concentrates (Rc) were used. There was no inhibition of mycelial growth with Imaxi at the three concentrates. On the other hand, Orizon and Achook had the same effect (100%) at 1/2RC and 1/4RC, but at RC it exhibited 50% mycelial growth. However Cord exhibited 50% mycelial growth at both RC and 1I2RC, while at 1/4RC mycelial growth was approximate 75%. In addition, the efficacy of tested combinations (Biovar plus each of Cord, Imaxi, Orizon and Achook) was evaluated under greenhouse conditions on cucumber against the whitefly, Bemesia tabaci (Genn.) at the recommended and half recommended rates. The combinations of the bioinsecticide: Biovar 4% WP at recommended concentration, (200 gm/l00 L.) plus Imaxi 35%EC at its half recommended rate 1/2RC (37.5 cm³/lOOL.); Biovar 4% WP at its RC plus Orizon 11%EC at its ~C (25 cm3/looL.) and Biovar 4% WP at its RC plus Achook 0.15%EC at its 1/2RC (93.7/100L.) achieved significant control of the whitefly, B. tabaci by decreasing the application rates of pesticides and obtaining good protection with less residuals. Also, the co-toxicity resulted from adding the Biovar to the Cord induced an irregular joint action against B. tabaci stages and resulted in dominated antagonistic effect. An additive effect was dominated in case of the addition of Biovar to Imaxi, Orizon and Achook by which the total mortality was higher than the mortality of summation of each compound separately. Thus, the joint action of two compounds in the mixtures was more effective against the tested insect than each compound alone.
Aleyrodidae.
Insecticides.
Entomopathogenic fungi.
Bemisia tabaci.
Beauveria bassiana.