In order to reduce pesticide residues in citrus, the following issues must be taken into account when using pesticides. We are manufacturer for kinds of Edible Fungus, main product is morchella esculenta. Edible Fungus Edible Fungus,Mushroom Edible Fungus,Organic Edible Fungus,Shiitake Edible Fungus Chengdu Minghe Agriculture Co.,Ltd , http://www.cdmhny.com
1. In strict accordance with national regulations, it is prohibited to use highly toxic and high-residual pesticides such as HCH, DDT, methamidophos, carbofuran, dicofol, etc.; for restricted pesticides, strictly follow the prescribed application concentration and dosage form. , application times, modes of administration, and safety intervals. Use oil preparations, sulfur preparations, plant-derived pesticides, copper preparations, microbial pesticides, antibiotic pesticides, specific insecticides, and selective insecticides and fungicides as much as possible.
2. Grasp the appropriate period of application should strengthen the pest forecast and forecast work, according to the occurrence of pests and diseases to master the appropriate application period. The spraying effect is mainly affected by the growth stage of the infested pests, generally young instar larvae and the nymphs are weak in drug resistance, and the older adults are resistant to insecticides. Such as ticks and whiteflies pests, in the young larvae, nymph stage drug control effect is good, later with the worm age increases, the body attached to the wax shell or wax powder constantly thickened and increased, its resistance gradually increased, the effect of drug control decreasing gradually. For example, the use of Youlede to prevent and treat the skeletal warts of the larvae is very effective, but it is basically ineffective at the end of 2nd instar or 3rd instar (female adults). Most of the bactericides are protective agents and must be sprayed before the pathogens invade the plant tissues in order to effectively prevent and treat diseases.
3. According to the object of control, select targeted pesticides. When two kinds of pests and diseases occur concurrently, it is advisable to use their own selective agents for prevention and control. Do not arbitrarily mix. Some medicines can cure some other diseases or pests, but they are only effective against several of the main control objects in the same group. For example, although Nisolulon is an acaricide, it only has good effects on leafhoppers such as mandarin spider mite, but it has poor effects on the prevention and treatment of rust mites. Abamectin has a good control effect against rust mites, but it does Orange spider has a poor control effect. Although pyrethroids, kung-fu, and other pyrethroids can kill fleas, they are not suitable as acaricides because they do not kill eggs and have a short shelf life. They should only occur in insect moths such as moths, flies, mosquitoes, and aphids. For a long time use and concurrent treatment of fleas; acaricides have a certain control effect on pups, but not as a special drug to kill lice; phalloides, konjac, triazosin, and tolk, etc. can only control citrus red Spiders and rust ticks and other ticks. Although thiophanate and carbendazim are broad-spectrum fungicides, they only have good control effects against penicillium, green mold and fluidic gum, and have poor control effects on canker and foot rot.
4. Rational use of medicines based on environmental factors The majority of pharmaceutical agents increase in potency as the temperature rises during application, with the most notable exceptions being Keziate, Triazolam, Tolc, Amitraz, and Alpha. For use at temperatures above 20°C. Most other pesticides have similar conditions. The use of lime sulfur and mineral oil emulsions in winter must also double the concentration to achieve a certain effect. In addition, since the acaricides such as Nissoline, sulfoxide, and amitraz, only kill eggs, they have a long reproductive cycle and a slow recovery of the population after spraying in the low-temperature period. Therefore, it takes a long time to control pests. The effect is good, and the spraying effect in the high temperature period is poor. Immediately after application, if it rains immediately, the liquid will be leached and diluted to reduce or even lose control effect. If it rains within 8 hours after application, the rain should be re-sprayed after stopping. Sunshine mainly affects the temperature and thus affects the control effect. Strong sunshine and drought will also aggravate the phytotoxicity of certain pesticides, especially the application of mineral oil emulsions, lime sulfur and pineine mixture, and more attention should be paid to preventing phytotoxicity.
5. Pay attention to the method of spraying and the concentration of pesticides that are parasitic on the surface of the tree. Spraying should be used. Pest control should be used to prevent stem pests and other insect pests. It is advisable to use poisoning soil to prevent and control underground pests. The application concentration of liquid medicine should be performed in accordance with the instructions for use, and it is not allowed to arbitrarily increase or decrease the use concentration.
Author: College of Horticulture and Gardening, Hunan Agricultural University