Monday, 21 January 2013

Insect - Pest of Guar Crop and their Control

As Guar is a rainy season crop, that's why, a number of insect pests feed and grow on its leaves and pods. Some important ones are described here.

Hairy caterpillars

Ascotis imparata and Spilosoma obliqua, Amsacta lactinae and Euproctis scintilans are the insects that cause heavy damage. The adult lays eggs in clusters over the surface of the leaves. The larvae cause characteristic skeletonisation of leaves during the early gregarious stage and later they completely defoliate the plant. The pest can easily be controlled by systematic collection of larvae during the early gregarious stage or spraying with Endosulfan @ 0.07 percent.

Empoasca fabae, Empoasca Kraemeri and Amrascakerri are serious pest of the crop. The nymph are wingless and found in abundance on the lower surface of the leaves. The nymph and adult pierce the plant tissues and suck the cell sap. Leaves become yellow at the margin. They can be controlled by: (i) soil application of systemic granular insecticides such as Aldicarb 10 G at the rate of 10 -15 kg per hectare. (ii) spray of Endosulphan 35 EC at the rate of 2litres in 1000 litres of water, or (iii) dusting of BHC 10% dust at the rate of 20 -25 kg per hectare.


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