Tomato yellow leaf curl virus disease prevention technology
Tomato yellow leaf curl virus disease is a virus disease transmitted by whitefungus. After the plants are infected with the virus, especially before flowering, the virus is affected. The fruit yield and the value of the product are greatly reduced, and the loss caused by serious damage can reach 100%. % is one of the most serious diseases affecting tomato production.
First, control strategy
Following the plant protection policy of "prevention-oriented, comprehensive prevention and control," flexible measures such as "avoid, resist, induce, and kill" should be adopted flexibly according to local conditions.
Second, comprehensive prevention and control measures
(a) Agricultural measures
The earlier the tomato disease infestation of the disease, the higher the incidence rate, so the prevention should be grasped from the nursery period, so that early prevention and early control, and strive to reduce the incidence of disease or not. (1) The nursery bed is separated from the culture shed. It is better to nurse the seedlings far away from the place of occurrence, remove the weeds before the nursery, kill the remaining adults, and thoroughly disinfect the soil of the nursery substrate and seedbed in the shed; (2) Nursery beds are covered with 40 to 60 mesh insecticide nets to prevent the entry of whiteflies and infections at seedling stage. (3) One week before planting, seedlings are sprayed on nursery beds to avoid worms or infected plants entering the planting field. 40 to 60 mesh insect nets covering the seedlings are isolated. Seedlings should be removed in a timely manner to reduce the source of the virus; (4) Use 40 to 60 mesh insect nets to cover all vents during tomato growth to prevent the spread of the whiteflies. Viral disease.
(b) Physical control
Using the yellowishness of adults of B. tabaci, yellow flies were hung in the field to kill Bemisia tabaci. The height of suspension was 10-20 cm higher than the top of the crop. The height of adult plants was appropriate to the middle of the crop, and 20 cm 25 cm yellow plates were suspended per acre. 80 pieces, used from the seedling stage, can reduce the insect pest population base number.
(III) Chemical Control
After emergence, the use of (1) 25% imidacloprid wettable powder 2000-2500 times in the early stage of the lower population density of B. tabaci, and (2) 1.8% of avermectin EC 2000-2500 times; (3) ) 25% of pymetrozine suspension 3000 times; (4) 25% buprofezin WP 1000 times; (5) acres sprayed with 22.4% spirotetramat suspension 25 grams. The above agents should be used alternately to delay the development of drug resistance. When applying the pesticide, the positive and negative sides of the leaves of the crop should be sprayed thoroughly to improve the control effect.
When the field shows the symptoms of tomato leaf curl virus, spraying virus inhibitors in time to enhance fertilizer and water management, promote robust growth of plants and reduce the incidence of losses. Viral inhibitors may be selected from the group consisting of Ningnanmycin (such as bacteriocin), morpholinone, chlorobromoisocyanuric acid and the like.
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