A serious disease that has occurred on rice in China in recent years is stripe disease. Stripe disease is a virus disease transmitted by the planthopper. The disease has the characteristics of intermittent outbreaks, mainly to see the poisoning rate of the population of SBPH. After a certain period of accumulation, once the formation of a relatively strong group of poisoned people, it will trigger a few years of disease epidemic. In recent years, the epidemic is still in the epidemic period. If it does not prevent and control it may cause 30% to 50% of the loss, or even destroy it and destroy it, it is now at a critical time to prevent it.
The typical symptoms of rice stripe disease are: chlorotic yellow and white spots appear at the base of the heart of the seedling stage, then extend into yellow stripes parallel to the veins, and remain green between the stripes. Different varieties showed different performances. The yellow, white, soft, curled drooping, and dry-heart-shaped hearts of the indica, japonica and high-grass japonica rice. Dwarf japonica rice did not show dead heart-like shape, yellow-green inter-phase fringes appeared, tillering was reduced, diseased plants withered earlier; at the onset of disease, chlorotic yellow spots appeared at the base of the next leaf of the heart, followed by expansion to form irregular yellow-white streaks, and old The leaves are not significantly affected; after onset of joints, yellow-green stripes appear only in the lower part of the flag leaf, heading malformation, and less fruiting. This shows that the earlier the disease, the more serious the condition, the greater the loss.
Prevention and control require special tips: First, because the virus can only be transmitted by Laodelphax striatellus, “control pests and disease prevention†and “cutting off the source of poisons†are the basic guidelines for prevention and control. For the characteristics of the first, second and third generations of adult slugs moving into Putian and Honda and forming three incidence peaks, it is necessary to carry out multiple stages of prevention and control before they can work; second, the earlier the virus infection, the heavier the law, the "Covering Tian Tian Bao Datian, pre-institutional protection period" control strategy.
Chemical control generally begins in mid-June, with a focus on the prevention and control of Laodelphax striatellus at seedling stage. The recommended pesticides are: Insectrophos-methyl, pyriprodil, chlorpyrifos, fipronil, or their mixtures. preparation.
Datian spray control should pay attention to the return of green rice to the tillering stage. The following medicines can be used: imidacloprid, chlorpyrifos (long-acting sustained-release agent), fipronil (Frigidol), isoprocarb (Yefei San) and thiamethoxam, Buprofezin, avermectin and so on. It is suggested that drugs should be rotated to delay the resistance of Laodelphax striatellus; choose pyridones, fipronil, thiamethoxam, imidacloprid, etc. with better persistence, and chlorpyrifos, isoprocarb, chlorimicarb, and dichlorvos with better immediate effect. Such as mixing, in order to improve the control effect.
In addition, imidacloprid and fipronil (Frigerine) seed dressing can also be used. Chlorobromoisocyanuric acid can be sprayed at the beginning of the disease (sterilomized, sterilized into), Ningnanmycin (inhibitory effect), and it can inhibit the virus. Reduce the effect of symptoms.
In addition, plough irrigation, clear the fields and fields, weeds, roadside weeds, and concentrate on farrowing and far away from wheat and corn fields, can reduce the source of the virus; appropriately delay the sowing date, plant resistant varieties, increase phosphorus, potash, Strengthening management is also a necessary comprehensive prevention and control measure.
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