Evaluation fo Coccinelid Predator and an Entomopathogenic fungus for biological Control against the Pea Aphid on Field Pea.
2007
Kemal Ali and VdM. Louw,S.
The effects of a cocdnellid predator, Hippodamia variegata (Coleoptera: Cocdnellidae), and an entomopathogenic fungus, Beauveria bassiana, m regulating pea aphid populations on field pea was evaluated in field cages in Bloemfontein, South Africa during 2001. Caged plants were inoculated with (one aphid/plant) density of aphids, and the predator fungus biocontrol agent was introduced after the population had reached 10-12 aphids/plant. After the 3rd week of cocdnellid introduction aphid incidence was significantly lower in the H. variegata treatments than in the Beauveria and infested control treatments. Cocdnellid-treated plots had fewer aphids (52/sampling unit) in comparison to fungus-treated (102/ sampling unit) and infested control (108/ sampling unit) plots. One H. variegata applied at one cocdnellid adult per 200 pea aphids (1:200) provided the best aphid control and an optimum grain yield of 2000 kg/ha. Yield in the fungus treated plots was 1830 kg/ha and was comparable to the infested, untreated plots of 1700 kg/ha. Use of H. variegata as a control agent increased yields by 18.0%.
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