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Seedling stage in rice diseases, pests control

2016-08-25
Seedling rice is mainly affected by the weed harm, in the 7th to 10th day after sowing of rice will be the first peak out, weeds Barnyard grass, monochoria, leptochloa also occurs about 3 days later; the second peak in grass seed around the 20th day after, dominated by broadleaf weeds and sedges.
Control of weeds in seedling stage can be closed before the seedlings and seedling stems, as well as the leaves after treatment.
Preemergence to close 30% pretilachlor (additional security agents) 100 ml to look after the germination of rice seeds to ensure rice roots security agents.
After the seedlings against barnyardgrass, choice of 25 g/l five fluorosulfonic metolachlor fluorosulfonic metolachlor, and 4%-b • bensulfuron, and quinclorac bispyribac-or-27.5%-. bispyribac, they use, to larger seedlings before spraying, or prone to injury. The first two both some broadleaf weeds.
Leptochloa: 10% cyhalofop-butyl water emulsions or emulsifiable concentrate formulations prevent, more environmentally friendly.
Black-streaked dwarf disease: caused by black-streaked dwarf virus, the transmission medium is mainly white-backed planthopper. Onset typically present in rice plant dwarf, dark green leaves, leaves and stems appear milky white or waxy white, dark brown small bumps back, high tillering and section of stem angry fibrous roots, not heading or spike, strong bad. The folds of the flag leaf or leaf is visible bump, a stump with 1 or a few plants are shorter than healthy 1/3, half an ear.
Susceptible period mainly in front of the tiller of rice seedlings, seedling stage and early Honda, after jointing not susceptible. Most susceptible to 2~6. Infections in the early rice seedlings and tillering of basic crops.
Treatment: mainly through the White-backed planthopper in controlling disease. Buprofezin, 25%, 50%, pymetrozine, 80% en-DL • pymetrozine, such as prevention and treatment. Direct seeded fields, sowing the 7-10 days after medication.