How to release Trichogramma in the forest? The artificial reproduction of Trichogramma is mainly for the purpose of dispersing forest pests and controlling forest pests, and how to release Trichogramma directly relates to the control effect. Therefore, in addition to understanding the spawning period, egg development period and quantity of pests, appropriate measures are taken. It is especially important to master the time and quantity of bees, and to distribute the bees in the forest in a timely and appropriate manner. 1 insect investigation Investigating the occurrence of pests, we must first understand the habits of pests. Because of the different types of pests, the habits of life will be different. Even with the same kind of pests, living habits are different in different regions and different climatic conditions. Therefore, before the investigation of the pest situation, according to the occurrence of pests recorded in the local calendar year, combined with the climatic conditions of the year to conduct an analysis and study, predict the generation of pests and the generation period of each generation. Under this premise, the investigation is carried out around the goal of killing eggs to accurately grasp the spawning situation of pest moths. 1.1 Observing adults This observation is mainly to use the phototaxis and chemotaxis of adult pests. It can be induced by other methods such as black light and poplar branches, and the moths and moths are recorded in detail. The appearance of moths also indicates that the egg-laying between the woodlands is about to begin, and the moth is in its prime. 1.2 Investigating eggs In the forest, egg inspection can be carried out by fixed-point, fixed-plant, and regular methods to investigate the number of eggs laid by pests. 5-10 survey points are uniformly fixed in each forest land. Each point is fixed by plant or square meter depending on the type of forest. For example, 2 m 2 per point, 5 points is 10 m 2 . At the same time, in order to understand the situation in time, it is necessary to check the eggs once every 2-3 days, and record the situation of the eggs in detail. Every time the eggs seized should be removed, in order to prevent the next repeated statistics, and also pay attention to the parasitic situation of natural enemies. Through the above two surveys, it is possible to grasp the initial, prosperous and final stages of pest moth spawning, so that timely and appropriate amount of bee can be released. 2 Put the bee in time The individual development of the parasitic eggs of Trichogramma and the embryonic development of the eggs and eggs, the more fresh the host eggs, the higher the parasitic rate of the bees. Therefore, it is necessary to put the bees to kill the eggs in time when the eggs are fresh, which is also a key point for effectively preventing and controlling forest pests. 2.1 Starting time The red-eye bee is usually released from the time when the pests fly to the forest to lay eggs, and then the bees continue to be released as the pests lay their eggs. It should be noted that it is not necessary to put bees or pests to lay eggs before the pests occur, which will greatly reduce the control effect. 2.2 Number of days and duration of bee intervals When pests lay eggs in the forest, they begin to release bees. However, due to different control objects, different pest occurrences, bee-keeping methods, and inconsistent life spans of adults in forests, it is difficult to make time and time for beeing. Uniform provisions. Generally, there should be a long-term presence of bees in the forest, and often maintain a proper amount of bee parasite eggs. Therefore, it is necessary to look at the way of bee-taking. If the bee foil is placed, the bee is feathered in 1~2 d, then every 1- Put the bee once in 2 days; if there is no subsequent force in the bee, it should be doubled than the number of bees placed on the bee, and the bee is placed once a day. Secondly, look at the bee's vitality, climatic conditions and inter-forest microclimate suitability, the length of life of the released bees and the spawning of pests, etc. If the bee body is strong, the temperature and humidity are suitable, the lifespan of Trichogramma is longer, and the number of eggs laid by the pests If it does not increase, the interval between bees will be extended as appropriate, and vice versa. The duration of beekeeping depends on the length of the spawning period of the pests, the size of the eggs, and the situation of the bees on the bee parasitic forests in the first few batches. If the pests have a long spawning period and the number of eggs dropped If you are big, you should put the bee on a long period of time, and vice versa. 3 right amount of bee The commonly used bee amount is 150,000 heads/hm 2 each time. If the amount of eggs is large, put more bees, and if so, put fewer bees. Generally, the first 1-2 times of bee feeding can increase the amount of bees according to the spawning situation of the pests, so as to concentrate the advantages and eliminate the early insect sources. At the same time, the amount of bee should be increased accordingly during the peak period of pest spawning, and the hatching rate of pest eggs should be minimized to control the damage. When the eggs fall into the final stage, the number of eggs laid by the pests is small, so they should be placed or parked as appropriate. When bees are placed, the type of bee, the strength of the body, the sex ratio, the suitability of environmental conditions, and the high and low egg parasitism rate are also important factors that directly affect the control effect. Therefore, these factors must be taken into consideration when determining the amount of bee. If the bee prefers to parasitize the pest eggs, the viability is strong, the ratio of male to female is large, the environmental conditions such as temperature and humidity are suitable, and the natural predators have obvious inhibition effects, then the number of bees can be appropriately reduced, and vice versa. Adjust the number of bees to be placed according to the beekeeping effect. 4 Conclusion In short, the time, number of times, and the amount of bee should be determined according to the above situation. At the same time, the bee should be flexibly controlled according to the generation of the pests, the overlapping of the generations and the degree of its harmfulness, and maximize the control of the occurrence of pests. harm. Cervical Tractor,Tractor Cervical,Cervical Vertebra Tractor,Cervical Traction Tractor Hebei Dingli Medical Equipment Co., Ltd. , https://www.dinglimed.com
