With the arrival of November, after more than two months of growth, the strawberries in the sheds have begun to bloom. However, major pests such as aphids, thrips, and red spiders on strawberries are also starting to make a move. These small pests are highly concealed and are not easy to detect in the early stage, but their rapid reproduction can easily cause disasters and cause greater losses to the economy. Therefore, in order to detect and control them early, it is necessary to strengthen the census of insect conditions. First of all, one of the most common pests on strawberries is aphids, the main of which are cotton aphids and peach aphids. They gather on the back of strawberry leaves, heart leaves, and petioles, sucking strawberry juice and secreting honeydew. When the growth point and heart leaves are damaged, the leaves will shrink, twist and deform, thus affecting the normal growth of the plant. In the initial control, it is necessary to check the back of each strawberry leaf to find and remove aphids in time. Then, the thrips on the strawberry will also damage the strawberry leaves, and leave tooth marks, the leaves are initially white spots and then connected into patches, and the leaves become smaller, shrink, and even yellow, dry and withered when the damage is serious, thus affecting photosynthesis. Not only that, thrips can also be harmed during the flowering period, which may cause stamens distortion, flower sterility, petal fragmentation, etc., and even affect the economic value of the fruit.
In addition, thrips are also capable of transmitting a variety of viruses that can cause even more damage to strawberry production. Therefore, for the control of thrips, we need to take more targeted measures, such as spraying disinfectants and feeding natural enemies. Finally, the main species of spider mites that infest strawberries are two-spotted leaf mites. Adult, young and mites suck the sap on the back of the leaf and form a net. In the early stage, there are scattered green spots on the leaf surface, and in severe cases, there are white spots, which eventually lead to scorched and falling off leaves, resulting in premature plant aging. For the control of red spiders, we can use acaricides and enhanced ventilation to ensure the healthy growth of strawberries. The occurrence pattern of these pests also needs our attention. First of all, the aphid in the greenhouse strawberry damage is mainly concentrated in September-December and February-May, the peak period is in the month, mostly in the young leaves, petioles, leaf back activities to suck sap, secrete honeydew to pollute the leaves, at the same time, aphids can also spread viruses, so that the seedlings are degraded. Secondly, warm, dry weather favors the occurrence of thrips. In the Beijing area, solar greenhouses occur annually and breed in them for overwintering, generally 15-20 generations;Spring and autumn sheds occur at the beginning of June and continue until harvest.
Eggs, nymphs, and adults often lurk in the overlap of flower centers and petals, which have strong concealment, and it is difficult for general insecticides to directly contact and kill insects. Finally, the young mites of the red spider and the early stage of the mite are not very active, and the later stage of the mite is lively and gluttonous, and has the Xi of climbing up. They damage the lower leaves first and then spread upwards. In conclusion, these pests on strawberries have a tremendous impact on the economy. In order to detect and control them early, it is necessary to strengthen the insect census and take targeted control measures. In addition, we also need to strengthen publicity to raise people's awareness of insect control and jointly maintain the development of the strawberry industry. Only in this way can we ensure the normal growth and development of strawberries and bring more health and deliciousness to people. In agricultural production, spider mites and thrips are common pests that cause great damage to crops. Spider mites prefer hot and arid environments, while thrips pose a great threat to crops such as strawberries. In order to effectively control these pests, farmers need to take a series of measures. First of all, there are some agricultural measures that farmers can take to control spider mites. They can remove old and diseased leaves from crops in time and remove weeds around the field to reduce the breeding grounds of spider mites.
In addition, farmers can also set up insect nets in greenhouse vents to prevent spider mites from entering. In greenhouses, yellow boards can be used to trap winged aphids, with 10-20 yellow boards hanging in each greenhouse, slightly 10-20 cm higher than the crop, and replaced regularly. In addition, some natural predators, such as ladybugs, can be released to control the population of spider mites. In the early stage of the occurrence of red spiders, 100 ladybug eggs can be placed per acre. However, it is necessary to pay attention to the protection of natural predators such as lacewings, aphid-eating flies, and aphid cocoon wasps. If the above methods are ineffective, some agents can be selected for control, such as thiamethoxam, acetamiprid, avermectin or halodimidoxonil, for foliar spray. However, it is necessary to pay attention to the rotation of the use of pesticides to avoid the development of drug resistance and drug damage. Avoid the flowering period of crops and move bees out of the greenhouse to avoid pesticide damage. Secondly, for the prevention and control of thrips, farmers can also take some agricultural measures. They can remove weeds in and around the field and reduce the breeding ground for thrips. In addition, ensuring good irrigation of crops can also reduce the damage of thrips. In terms of physical control, blue or yellow insect traps can be used to lure thrips.
20-30 insect traps can be hung on each acre, 15-20 cm from the top of the plant, and the height can be adjusted as the crop grows. In addition, natural predators can be used to control the number of thrips. When thrips are found in greenhouses, they can release 20,000 per acre of land. It is released once a month and can effectively control the damage of thrips. However, pesticides must not be used 7 days before and during the release of natural predators. If the insect count is low, some agents can be used for control, such as emamectin, avermectin, etc. If severe conditions occur, foliar sprays can be applied with ethyl spinosad. When using pesticides, it is necessary to pay attention to the alternating use of different pesticides to weaken their resistance, and to spray on crops and soil, since some thrips larvae pupate in the soil. In summary, the control of spider mites and thrips is a very important job in agricultural production. Through the adoption of agricultural measures, physical control, biological control and pesticide control, the number of these pests can be effectively controlled, and the normal growth and yield of crops can be guaranteed. However, farmers need to choose carefully and use them rationally when choosing control methods and agents to avoid harm to the environment and the human body.
At the same time, when implementing prevention and control measures, it is necessary to closely observe and monitor them, and adjust the measures in a timely manner to ensure the effectiveness of prevention and control. Only in this way can the safety of crops and the sustainable development of agriculture be guaranteed. Spider mites are a common agricultural pest that poses a great threat to the growth and yield of crops. In order to effectively control the breeding and spread of spider mites, farmers can take a number of control measures, including agricultural control, biological control and pesticide control. In terms of agricultural control, removing weeds from the field is an important measure, as weeds are one of the main habitats of spider mites. In addition, removing the old leaves and insect leaves at the bottom in time and taking them out of the field for destruction can also effectively reduce the number of spider mites. Biological control is a more environmentally friendly and sustainable method of control. In the early stages of spider mite, some natural predators can be released to control the pest population. For example, Blunt pasteurii or Chilean mildhorn mites can be released in the field at 50-150 or 3-6 per square meter. These predators can eat spider mites, which play a role in controlling the population. Of course, pharmaceutical prevention and control is also a commonly used method. In the early stages of spider mite, there are some agents that can be used to spray.
Commonly used agents include 43% bifenazine ester suspension, 5% thiobenone EC and 18% avermectin. The concentration of these agents is 2000-3000 times or 1500 times. It is generally recommended to spray every 7 days to ensure the effect. However, it is important to note that some agents are toxic to bees, such as bifenazide and avermectin. Therefore, when spraying control, avoid the flowering period of strawberries and move the bees out of the shed to avoid causing harm to the bees. In contrast, thioxenone is non-toxic to bees, so it can be used with confidence. In summary, controlling the reproduction and spread of spider mites is one of the important tasks for farmers. By taking measures such as agricultural control, biological control and pesticide control, the population of spider mites can be effectively controlled and the growth and yield of crops can be protected. However, when using pesticides for control, it is necessary to pay attention to the safety of bees and avoid causing harm to them. In this way, sustainable agriculture can be achieved.
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