The critical period for controlling citrus spider mites is during germination to flowering in the spring. Medication pay attention to rotation and mixed use, and take appropriate concentrations. Adult trees should be well-earned in early spring and late autumn. In addition to spring and autumn, nursery and young trees should be strengthened in winter.
1. Take the precautions of early spraying and use the principle of protecting and utilizing natural enemies in the later period. After fruit-picking and before citrus flowering, the number of wormholes is directly related to the larvae in the coming year. Spraying insects in the winter will lower the larval density to less than 10 louvers, so that the plants will not be damaged by pod damage before flowering. Dead leaves. After Xie Hua, the number of natural enemies increased, and it should be done as far as possible not to spray pesticides in all directions. In particular, highly toxic pesticides and Bordeaux mixture, etc., should be replaced by general rule, control the origin of insects, and reduce the density of harmful insects to protect natural enemies. . In winter and dry spring years, it is necessary to timely irrigate to ensure that the citrus groves have sufficient moisture and humidity to maintain the spring shoots, which is conducive to the prevalence of natural enemies and parasites, resulting in adverse environmental conditions for citrus spider mites to reduce It is harmful. Some plants could cause discoloration of new shoots due to loss of control, and 0.5% urea could be added to the liquid as a top dressing, enhancing plant nutrition, promoting leaf turning green and reducing its damage.
2, the use of chemical control. The agents used before citrus blossom are: 20% chlorenone wettable powder 4000-5000 times, 5% Nisolubicin oil 2000-4000 times, in the past due to the continuous application of a single organic phosphorus or organochlorine pesticides,螨 螨 抗 抗 抗 抗 抗 抗 抗 抗 抗 抗 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 效力 。 。 。 。 。 。 。 。 。 。. Organic phosphorus, organic chlorine, sulfur preparations, diesel emulsions and other rotating applications can delay and prevent the emergence of fleas resistance.
At present, the commonly used pesticides are: colloidal sulfur 400 times, crystal lime sulfur 200-300 times, lime sulfur 1.002-1.003 kg/L (Baume 0.3-0.5), 95% oil emulsion 100-200 times, 5% Nisolulur emulsion 2000-4000 times solution, 50% bromodecyl ester EC 1500-2000 times solution, 50% Apollo EC 5000-6000 times solution, and 10% Western Douglas EC 2000-3000 times solution. After flowering, the temperature is relatively high. In addition to the use of the above-mentioned agents, it is also possible to use 73% Ketite EC 2000-3000 times.
Precautions: spray should be uniform and careful, pay attention to the back spray.
3. Biological control The use and protection of natural enemies have significant control effects on citrus red spiders, especially the predatory mites and the ladybirds of the chyme. During March-May and September-October, on an orange tree with less than 2 leaves per locust locust, each bird released 200-400 heads of N. obliquus or Newcastle blister, one month later. It can effectively control its damage. When the prey density was too high, the control effect of N. benthamiana was better than that of New York's obtuse cockroach, but the field population of Newt's cockroach was more stable than that of N. obliquus. Do not spray highly toxic pesticides after insecticide in citrus orchards.
There are many natural enemies of citrus red spiders. There are nearly 100 species, among which the main predators are: Newt's cockroach, Nissl's cockroach, Lago's cockroach), Dew's cockroach, Big cockroach, and tumor-bearing cockroaches. There are six kinds of quail, and other species of ladybugs are: Deep-spot ladybird ladybugs, Guangdong ladybug ladybugs, Abdomen pipe ladybug ladybugs, Beam tube ladybug ladybugs, Black-shelled ladybug ladybugs). Ladybirds, Binchuan Ladybugs, Ladybirds of Yunnan Province, and Ladybugs of Guangxi Province; in addition to grasshoppers, whiteflies, carnivorous thrips, and some beneficial microbes, these natural enemies have Significant inhibitory effects should be protected and utilized.
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