Summer and autumn is the key period for the growth of citrus, and it is also the peak period of using pesticides to control pests and weeds. If the drug is used carelessly, it often causes some side effects, such as stimulating insect pests, poisoning orange trees, and the appearance of flower faces, etc., which must arouse the attention of the majority of farmers.
The prevention of the production of pesticides such as dimethoate, omethoate and isocarbophos is a routine effect agent for the control of citrus pests. However, in the high-temperature and dry season with temperatures of 28°C to 30°C, the above-mentioned emulsion pesticides are used during the fruit coloring period. As long as spraying 1 or 2 times, stripe spotting is likely to occur on the fruit surface, and the quality of the orange fruit is seriously affected. The reason is that during the fruit growing period, after spraying pesticides such as omethoate in the orange orchard, the medicine flowed down along the skin of the fruit, and the time for the medicine to stay was relatively long. It was evaporate and concentrated due to the high ambient temperature, and the concentration became higher and the green young skin was. After being sterilized, it turns brown and remains on the epidermis of young fruit. With the advent of the fruit coloring period, the victim's light brown is set off and streaks appear. During the period from July to September, the pesticide was inadvertently used in the control of citrus spider mites, rust ticks, and scale insects. 127 times of Yunda-120 plus 0.2% white sugar mixed solution should be promptly sprayed 1 or 2 times each time. 7 to 10 days, can reduce injury. In addition, dicofol and triclosan have good effects on fleas, but because citrus is a chlorine-tolerant plant, it is easy to cause phytotoxicity after application, light leaves cause long-term gray and dull leaves, affect photosynthesis, and light frost in winter. That is, shedding, and the elderly are debrided for several days. In the fruit swelling period and the autumn shoot period, the use of dimehypo could cause phytotoxicity. The initial surface of the fruit showed yellow bean-sized macules, and later lesions gradually expanded until the whole fruit yellowed. The fruits of light injury can normally mature; if the injury is too heavy, it will result in fruit drop, affecting the current season production.
To prevent aggravation of insect pests, phytonthrin has a good effect on the killing of citrus aphids, swallowtail butterflies, leaf miners, etc., but it contributes to the growth of red spider mites. After using this medicine, the population of red spiders can rise in a short period of time. , causing disasters. Bordeaux liquids have good control effects on citrus scab, resin disease, anthrax, etc., but summer and autumn are the peak period of orange rust ticks. Bordeaux liquid has a strong evoked effect on them, which can shorten the egg period. The development of pups is accelerated, and the amount of eggs laid by pupae is increased. At the same time, it can also kill the major natural enemies, the trichomes. Therefore, the Bordeaux mixture should not be used in summer or autumn orange gardens. Destroyed to help the red spider also contributed to the role of the dragon, after use can improve the viability of red spider tadpoles, speed up the hatching of eggs, so that the population density of worms showed an upward trend. These pesticides cannot be used during the summer and hot seasons, especially during the peak period of red spider eggs. Otherwise it will contribute to the outbreak of pests.
Preventing the ignition of sulfuric acid is a commonly used pesticide in citrus orchards, both to prevent disease and kill insects. However, according to related studies, the use of lime sulfur mixture in the summer and autumn high temperature season will not only kill the parasitic natural enemies of the rust tick, induce rust wall lice, but also induce and aggravate the occurrence of citrus sunburn and burns. The new shoots and new leaves of citrus make the tree weak and the quality of the fruit deteriorate. Therefore, the use of lime sulfur in orange orchard is not arbitrary, and the application concentration must be strictly controlled when necessary. It is appropriate to use Baume 0.1-0.2 degrees, and the temperature must not exceed 35°C.
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