Application of chemical pesticides to prevent vegetable pests, the first problem encountered in field operations is to grasp the appropriate period of spraying control. In this regard, the failure of the lesson taught us: early prevention and control of pesticides can not control the occurrence of a large number of subsequent pests, prevention and treatment of late drugs can not cure the dangers of old drug resistant pests, too sooner or later will cause reduced control efficiency, pesticide waste. How to determine the period of pest control on planted vegetables? The successful experience tells us that we must choose our own time to control the pests of vegetables. From the six aspects of searching, forecasting, reminiscing in past years, diligently inquiring, seeing neighbors, observing trends, and verifying sentiment, it is possible to conclusively analyze and accurately infer self-determine pest control period, and then pay close attention to timely prevention and treatment. According to grasping the distance, the specific practices in the six aspects are described as follows: To develop vegetable production from pests and diseases. The agricultural departments of various regions will publish the long-term estimation of the incidence of vegetable pests in the year; the type, occurrence period, occurrence, and damage level of the forecast. Or at the stage of growth of various vegetables, according to the investigation of pests and diseases, scientifically publish short-term forecasts of the occurrence and prevention of local vegetable pests and diseases. It is necessary to find a way to seek for such predictable and predictable information on the occurrence of such highly authoritative diseases and insect pests, and then to know the anticipation and play a guiding role in monitoring the prevention and control period. Recalling previous years. Various vegetable pests have self-harmonious rules that harmonize with the environment, such as the harm of cabbage caterpillars and the annual climate, cruciferous vegetable foodstuffs. This is precisely the way in which the vegetables are planted in the same period of each year and the pests are harmed every year. The period is basically the same in the local area. Therefore, recalling and referring to the period of occurrence of harm and prevention during the calendar year, and referring to other information, it can be prepared as the period for prevention and control this year. Inquire about it. In the past year, the occurrence and growth of pests and diseases in different regions were early or late, and due to the limitations of the growers' observations, the pests were not well aware of the current dynamics of pests, but the agricultural technicians in the region who had technical guidance had a wide range of regional pests. The occurrence of dynamic data can clearly indicate the period of certain pest control. For this reason, the peasants in charge of cadres must take the initiative to inquire or diligently call to inquire about the pest situation at this time so as to obtain an accurate prevention and control period. See four neighbors. Under the current conditions of large-scale production of vegetable and vegetable production and field management responsibility, the level of management technology of each individual is somewhat different. When it is hesitant to prevent and treat certain vegetable pests, it is important to observe the prevention and control of the neighbors in the village. In particular, some growers and talents have rich experience in pest management. Once they have some prevention and control actions, they can use the stones of other hills as their own control period. Outlook moves. Vegetable pests have a fixed growth and development stage throughout their lives. If the cabbage white butterfly eggs, larvae, cockroaches, adults four stages. When the cabbage white butterfly insects fly around the cruciferous vegetable field, it means that the egg lays gradually become harming period of cabbage caterpillars, and at this time, we must be particularly vigilant about the pests that will occur in the field. Under the premise of being familiar with various vegetable pests and their growth and development rules, observe the signs of adult emergence in the early stage to determine the possible harm period and prevention and control period. Check the situation. The most timely and accurate prevention and control period is to check the progress of the development of pests on the ground of their own planting vegetables. It is necessary to carefully check the developmental stages and adult populations of pest eggs and larvae according to various pest infestation sites. Generally speaking, when it is detected that the meat insects such as cabbage caterpillar, diamondback moth, beet armyworm and lycopene are in front of the third instar period, the spot insects such as the cabbage worm, whitefly, and red spider have emerged at the initial stage. At the time of egg production at the time of egg fly and eggplant cocooning, and during pre-drilling, yellow-banded jumpweed, yellow-shouldered melon, melon flies, breeding fly, and thrips must all be placed at the early stage of adult emergence to timely carry out prevention and control of chemical pesticides. Can receive significant results.
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