How to control pests and diseases in hotel landscaping.

Treatment of pests and diseases: methods of pest control: mainly artificial trapping and spraying. When using chemical agents, we should prescribe the right medicine according to the types of pests and diseases and living habits. Treatment of diseases: First, we must find out the cause and history, and then take corresponding drugs. The diseases of trees generally include powdery mildew, mosaic, canker, rust and so on. Warning areas should be set up when spraying drugs to avoid human and animal poisoning. Pests and diseases are based on the principle of "prevention first, comprehensive prevention". Comprehensive control measures include plant quarantine, biological control, cultivation measures and chemical control. As mentioned above, the choice of tree species should be matched with each other to avoid planting two adjacent parasitic trees. If apples, pears, etc. Conifers and cypresses are planted, which are prone to rust. Street trees should also be changed at intervals to isolate diseases.

Painting willow trees white immediately after planting can prevent dry pests such as longicorn beetles and brown beetles from laying eggs on the trunk. It can prevent rot and canker, and delay the germination period of buds. Avoiding freezing branches and buds can also prevent sunburn. The common formula of tree trunk brightener is: 10 part water, 3 parts quicklime, 0.5 part stone sulfur mixture stock solution, 5 parts salt, and a little oil (animal and vegetable oil can be used). The painting height should be above the ground diameter1m-1m. Second, the pesticide burying method is to dig holes in the soil layer at the root of trees and apply granules with strong internal absorption (omethoate, carbofuran granules, etc.). ), absorbed by the roots and transported to the stems, branches and leaves of the above-ground parts, and the pests died of poisoning after feeding. This method can control scale insects, aphids, borers and so on. This method is not affected by temperature, precipitation and tree height. And the drug effect is long-lasting. For example, carbofuran can last for 3 months, and it only needs to be buried twice a year. The method is: dig 3-4 pits (or holes) with a depth of half a meter around the tree in the root system intensive area 60 cm away from the trunk. Put 50-80 grams of carbofuran in each pit. Fill the pit (hole) with water, and the solution will accelerate the absorption of roots. Fertilization in spring and summer can be combined with fertilization at the same time. If it is used together with compound fertilizer or urea, the efficacy of carbofuran can be higher and faster, and it can kill two birds with one stone. Third, the trunk injection method is to drill holes around the trunk to inject drugs, so that the whole tree has active ingredients of pesticides. Wherever pests feed, they will be poisoned and die. This method is simple to operate, saves labor and medicine, does not pollute the air, does not harm natural enemies, and has good control effect. Can be used for preventing and controlling stem borers such as longicorn beetles, Dendrolimus punctatus and the like. Sucker pests such as aphids, scale insects and mites, various leaf-eating pests, tree felts, sooty blotch, etc. The application period can be carried out in the growing period from germination to defoliation, but the application effect is the best in April-August. No drugs can be used during the dormant period from defoliation to germination. Pesticides with strong internal absorption and no influence on tree growth should be selected. Such as 50% methamidophos EC, 40% omethoate EC, 75% carbofuran wettable powder and 50% monocrotophos EC. The specific selection of suitable pesticides varies with different pests and tree species.

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