Effect of relative humidity and temperature on the biotic agents of green scale Coccus viridis (Green)
The effect of relative humidity and temperature on the biotic agents of green scale. Coccus viridis (Green) was studied for a period of 12 months. Monthly observations i.e. from June 1986 to May 1987 were recorded from 30 market arabica coffee plants in an estate and studied fungus infected and insect parasitised green scale. Positive correlation was observed between relative humidity and fungal pathogen Verticillium lecanii and temperature and insect parasitoids. Maximum percentage of infection by V. lecanii was recorded in September when high RH 93 percent prevailed and the maximum parasitism was noticed in May, when temperature was 32.8 grade C. The study indicated that the infection of pathogen commencing in June reaches its peak in September affecting majority of the scales population and peak incidence of parasitism of the scales occurs in May. Among the three parasitoids recorded, Coccophagus sp. was quite common and the other two Prochiloneurus nr nigriflagellum (Girault) and Anicetus? annulatus Timberlake were sparse
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| Format: | biblioteca |
| Published: |
Jul
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| Subjects: | COFFEA ARABICA, COCCUS VIRIDIS, COCCIDIOS, HUMEDAD RELATIVA, TEMPERATURA, VERTICILLIUM LECANII, ENEMIGOS NATURALES, PARASITISMO, COCCOPHAGUS, PROCHILONEURUS NR NIGRIFLAGELLUM, ANICETUS? ANNULATUS, INDIA, |
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| Summary: | The effect of relative humidity and temperature on the biotic agents of green scale. Coccus viridis (Green) was studied for a period of 12 months. Monthly observations i.e. from June 1986 to May 1987 were recorded from 30 market arabica coffee plants in an estate and studied fungus infected and insect parasitised green scale. Positive correlation was observed between relative humidity and fungal pathogen Verticillium lecanii and temperature and insect parasitoids. Maximum percentage of infection by V. lecanii was recorded in September when high RH 93 percent prevailed and the maximum parasitism was noticed in May, when temperature was 32.8 grade C. The study indicated that the infection of pathogen commencing in June reaches its peak in September affecting majority of the scales population and peak incidence of parasitism of the scales occurs in May. Among the three parasitoids recorded, Coccophagus sp. was quite common and the other two Prochiloneurus nr nigriflagellum (Girault) and Anicetus? annulatus Timberlake were sparse |
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