Rice stem borer control measures
Also known as borers, rice stem borers may be affected from the tillering stage to the milk ripening stage, posing a threat to rice production and affecting yield and quality. It is of great significance to do a good job of prevention and control of stem borer, promote high yield of rice, and increase farmers' income.
I. Harmful symptoms The term larvae endangers the larvae at the time of delivery, causing dead heart seedlings and dry shoots; earing and heading damage caused by the booting and heading stages; half dry ears and worm-injured plants caused by grouting and milk ripening stages; Easy to reverse.
Second, the occurrence of characteristics in the second year of Liaobei, larvae in rice bran and straw in winter, in early May, phlegm, late emergence, adult activity at night, phototaxis, like thick stalks in the leaves, the growth of dense green rice The eggs are laid on the strains; the eggs are prolific in front of the tips of the leaves before the tillering stage, and are produced on the leaves 2 to 3 inches above the water surface after jointing; in the middle of June, the young larvae feed on the tip of the leaves, and the shoots appear in July. In the early days, there was a dead heart, and the larvae could be transformed. The second-generation larvae in the first half of August harmed the stems and appeared white spikes.
Third, comprehensive prevention and control to take "prevention as the main, and prevent the emphasis on governance," the principle of planting insect-resistant varieties, based on the rational use of timely drugs as the key to adhere to the cultivation measures and chemical control combination.
1. Cultivated measures Prevention of serious insect pests After the autumn harvest, the rice cultivars must be destroyed in a centralized manner, remove insect pests in the field, eradicate weeds in the fields, reduce intermediate hosts, eliminate overwintering larvae, and reduce the source of insects. Do a good job in autumn and winter, deep-dip 25 centimeters, resulting in excellent soil environment. Strengthen water and fertilizer management in paddy fields, increase manure fertilizer, reapply silicon fertilizer, apply 20-25 kg of silicon-silicon fertilizer per acre; transplant large blister fields 3 to 4 days before transplanting, deep water irrigation at the peak of the first generation (late June) One week, reduce the second generation of insect sources.
(2) Physical control Using the adult phototaxis, the black-light trapping effect is better when the cicada moth enters the prosperous stage.
3. Manual removal of pests of S. insults The larvae of S. insulting have the habit of first focusing and then dispersing and transferring. Before the eggs are hatched and transferred to the larvae, the injurious plants are removed and brought out of the field to eliminate a large number of larvae. Strain hazards.
4. Chemical control According to the forecast, about 1 week after the peak of the first generation larvae hatching (late June), it was found that when the dry shoot rate reached more than 3%, the pesticide was sprayed with 100-150 ml of 20% triazophos EC per acre. Description of watering spray; In early August when the dry shoots are seen, use 18% of insecticidal double water agent per acre 200 grams or 90% insecticide 50 grams 50 kilograms of water spray or water pouring 100 kilograms. Keep 3 to 5 cm of shallow water for 5 to 7 days after application.
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