Looking for forecasts. In order to develop vegetable production, it is protected from pests and diseases. The agricultural departments of each region will release the long-term estimated trend of the occurrence of vegetable diseases and insects in the year; the type, occurrence period, occurrence amount and degree of hazard of the forecast. Or in the various vegetable growth stages, based on the investigation of the occurrence of pests and diseases, scientifically publish short-term forecasts of the occurrence and control of local vegetable pests and diseases. It is necessary to find ways to seek the predictive and forecasting information of such authoritative pests and diseases, and then to know the foresight, and play a guiding role in monitoring the prevention and treatment period.
Recalling the past years. All kinds of vegetable pests have their own rules of occurrence in harmony with the environment, such as the damage of the cabbage caterpillar and the annual climate, the cruciferous vegetable food and planting period, which is exactly the same, the planting of the vegetables in the same period of the year, the annual occurrence of pests The period is basically the same in the local area, so the recall and reference period of the hazard facts and prevention period, and then refer to other information, you can prepare for this year's prevention and treatment period.
Inquired. In the past, the occurrence and growth of pests and diseases in early and late are more or less in different regions. Due to the limitations of the growers, it is unclear whether the current pests are dynamic, but the agricultural technical cadres engaged in technical guidance in the region have a wide range of regional pests. Dynamic data can be generated to clearly indicate the period of certain pest control. For this reason, the agricultural technology cadres should take the initiative to inquire or call to inquire about the situation at this time in order to get an accurate prevention period.
Look at the four neighbors. Under the current conditions of the production scale of vegetable and vegetable production and the responsibility system for field management, there are some differences in the management techniques of each person. When it is hesitant to control a certain vegetable pest, it is important to observe the prevention and control of the neighbors in the remote village. In particular, some planters can have a rich experience in pest control. Once they have preventive actions, they can use the stone of other mountains as their own prevention and treatment period.
Look at the direction. Vegetable pests have a fixed stage of growth and development throughout their lives. For example, the cabbage butterfly is divided into four stages: egg, larva, pupa and adult. When the adult white butterfly grows on the cruciferous vegetable field, it means that the spawning is approaching the period of rapeseed worms. At this time, we must be especially vigilant about the pest hazard that will occur in the field. Under the premise of familiarity with various vegetable pests and their growth and development, observe the macroscopic signs of adult emergence in the early stage to determine the possible hazard period and prevention period.
Check the truth. The most timely and accurate prevention and treatment period is to check the development progress of pests on their own vegetable fields. According to the habitat of various pests, carefully check the developmental stages of the eggs and larvae and the number of adults. Generally speaking, when the larvae of P. rapae, Plutella xylostella, beet armyworm, and Laiwu are inspected before the third instar, the leaf miner and spot are found at the beginning of the small insects such as rapeseed meal, whitefly, red spider, etc. When the larvae and the locusts are in the period of spawning and before the drill, the yellow stripe, yellow squash, melon, fly and thrips must be in the early stage of adulthood, and timely control of chemical pesticides Can receive significant results.
How to determine the period of drug control for vegetable pests
The application of chemical pesticides to control vegetable pests, the first problem encountered in field operations is to master the appropriate period of spraying control. In this regard, the lessons of failure tell us that the prevention and control of early-stage pesticides can not control the occurrence of a large number of subsequent pests. The prevention and treatment of late-stage medicaments can not cure the harmfulness of old-age resistant pests, and the early and late will cause the reduction of control effects and pesticide waste. So how do you determine the period of pest control on growing vegetables? Successful experience tells us that the choice of the time to control vegetable pests is self-mastered. From the investigations of finding the forecast, recalling the past year, inquiring, looking at the four neighbors, observing the trend, and checking the truth, the longitudinal analysis is used to accurately infer the period of pest control, and then grasp the timely prevention and control, and the results will be significant. According to the level of grasping the near and far, the specific practices of the six aspects are introduced as follows:
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