The reason why cucumbers sometimes produce phytotoxicity, from the point of view of pest control measures, first, misuse of pesticides that are not correct, the second is the application of excessive pesticide concentrations or repeated application of the same pesticide, the third is high temperature or high humidity application time. Drugs, the fourth is that the soil application is not uniform enough.
From the perspective of the cultivation environment, there are greenhouses and even cucumbers planted in the greenhouses, causing continuous stumbling obstacles. The soil has many latent pathogens or lacks certain nutrient elements. Second, the humidity in the greenhouse is too large and the moisture is not timely enough to induce pests and diseases. Therefore, the ability of cucumbers to resist pests and diseases is weakened, resulting in an increase in the number of medications; third is the partial application of nitrogen fertilizers, cucumbers grow too prosperous, shading is severe in the shed, and insects are easily induced, resulting in frequent medication; the fourth is from the cucumber itself In terms of habits, it is a shallow root crop with undeveloped root systems, shallow depth of entry, and a small amount of roots that are easy to lignify. Among the melon crops, cucumber is the least tolerant to drought, and the ability to absorb nutrients is weak. Therefore, immunity to pests and diseases is also weak.
In order to reduce or alleviate the loss caused by the use of pesticides in cucumbers cultivated in greenhouses, the following work should be done in the prevention and control measures.
First of all, we must create a good cultivation environment. First, according to the cucumber's fertility habits, fine soil preparation, so that its roots and strong seedlings; Second, to open a good ditch, easy irrigation and drainage; Third, layered cover film, easy to adjust the temperature and humidity control; Fourth, balanced fertilization, promote steady growth; To avoid repetition, practice rotation. After the change of cultivation environment, the probability of occurrence of pests and diseases has been relatively reduced, and the number of pesticides applied has also been reduced accordingly.
Second, it is necessary to distinguish the situation and apply medicine to cure injury. In addition to severe drug injury is difficult to lift the cucumber, the occurrence of moderate or mild injury can generally be alleviated by fertilization, application. One is the occurrence of scorch or shrinkage after application of the leaf edge, and can be sprayed with Huimanfeng or Zhuangfuxing active liquid fertilizer at a concentration of 1:500 to 800 times. Since the liquid fertilizer contains activated substance “KOMâ€, the pesticide can be released. Residual poison can make cucumber grow faster. The second reason is that when the application of slow-growing plant growth regulators is too high to inhibit the growth of cucumbers, they can be sprayed with 30 to 50 ml/kg of gibberellic acid or 2000 times of plant growth promoter “802â€; When the degree of wilting, 0.01% ~ 0.02% of brassinolide can be sprayed twice. The fourth is that when the blades are twisted and sag, they can be sprayed with a 1:100-fold aqueous solution of white sugar, which can relieve the phytotoxicity quickly.
Third, we must start prevention and enhance cucumber resistance. In order to improve the resilience of cucumber against disease, insects, weeds and phytotoxicity, several basic tasks must be done. The first is to increase the use of mature farm manures or plant-based commodity organic fertilizers, or bio-organic compound fertilizers as base fertilizers, vigorously optimize the soil environment, enhance the cucumber's ability to supply fertilizers and water, inhibit bacteria, repel pests, and reduce drug damage; The use of plant growth regulator Bi Hu 8000 ~ 10000 times before and after flowering sprayed 2 or 3 times; Third, the use of microbial inoculum 600 to 800 times liquid, spraying before and during the young fruit, can prevent the invasion of bacteria , strong physique, relieve drug damage, and promote the restoration of growth.
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