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Seasonal incidence of the sorghum earhead bug calocoris angustatus hemiptera heteroptera miridae



Seasonal incidence of the sorghum earhead bug calocoris angustatus hemiptera heteroptera miridae



Insect Science and its Application 5(6): 469-474



Seasonal incidence of the sorghum earhead bug, C. augustatus Lethierry, was studied by sowing the crop once in 10 days, throughout the year during 1978 and 1979, as well as by sowing it at 2 wk intervals from early kharif to late rabi during 1979. The bug was found throughout the year except for a few weeks during March, April and May. The milky stage of the earhead was the most preferred stage compared to preflowering, a 3rd flowering, flowering and ripening stages. The adults dominated during preflowing and a 3rd flowering stage, whereas nymphs dominated during milky and ripening stages. The computed seasonal indices were higher during Aug. (230), Sept. (222), Oct (224) and Jan. (215) when coincided with blooming and milky stage of sorghum in general fields. Correlation studies between the bug population at the milky stage and maximum tempertaure indicated negative and significant (r = -0.2967) relationship, and positive and significant (r = +0.2727) relationship with relative humidity. Low incidence of bugs was observed on the crop sown during June.

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