Commonly known as silkworm, silkworm, rootworm, cutworm, etc., all the beet production areas in our province have occurred and harm, generally can reduce sugar beet production 30% -50%, sugar reduction 2-3 degrees.
The law of occurrence occurs in late April as the first generation of larvae, and in mid-June as the second generation. From August to the middle of September, it is the third and fourth generations, with the third generation and the third generation. The fourth generation of harmful sugar beet mainly.
Adults have a strong phototaxis, adult eclosion, nectar nutrition, eggs are mainly in sugar beet seedlings, weeds (gray vegetables, spiny vegetables, etc.), withered grass and clods.
Prevention and control methods 1 Timely weeding, removal of adult groundworms spawning sites, and weeds were transported out of the field, to prevent the transfer of larvae on weeds damage to sugar beet. 2 Strengthen forecasting and timely detection of insect pests when using pesticides. Before eradicating ground tigers before the third instar, use 90% of trichlorfon crude drug 800-1000 times, or 50% phoxim 600-800 times. Liquid irrigation root prevention and treatment, general mu liquid medicine 50 kilograms, after 4 pm medication. Can also be used 50% phoxim EC mixed with water through the screening of fine dry soil dubbed toxic soil, mu with 12.5-15 kg of toxic soil, the article applied in field control. 3 Timely autumn tillage preparation, deep-lying the eggs laid on the surface of the ground tiger to the bottom of the plough layer to reduce the hatching rate of eggs so as to reduce the harm of the second year.
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