The use of medicinal fumigation methods to control pests and diseases in greenhouses has the advantages of labor saving, high efficiency, and no increase in humidity in the shed. Usage: Before using the smoke agent, it is necessary to close all the vents in the greenhouse, so that the shed is in a closed state, put the smoke agent on the walkway in the shed, ignite the smoke agent and close the shed exit. The smoke method is generally In the evening, the operator can close the shed after igniting the smoke agent, so that the shed can be closed all night to ensure even distribution of fine smoke particles in the shed.
Matters needing attention: (1) Buying smoke agents from regular channels and avoiding production losses caused by counterfeit and unqualified products. (2) According to the area of ​​the greenhouse and the instructions for use, select the appropriate dosage, and avoid the amount of random additives to avoid phytotoxicity. (3) Since the soot has a heat-induced migration, that is, a phenomenon in which the soot can be repelled by a hot object and deposited to a cold object. Therefore, the smoke agent should be ignited in the evening or early morning when the leaf temperature of the plant is low, which is conducive to the accumulation of smoke particles in the leaves, and is convenient and effective in the evening. (Zong Xiao) Proper selection of pesticides
As an important agricultural production material, pesticides play an irreplaceable role in increasing grain production, effective supply of agricultural products and increasing farmers' income. In recent years, the types and dosage forms of pesticides have developed rapidly. How to properly select pesticides for pest control in many pesticide products should focus on the following five aspects:
1. Select pesticides according to the control target. It is necessary to determine which one to control, the disease to choose fungicides, the pests to choose insecticides, the pests to choose acaricides, and the weeds to choose herbicides.
2. Select pesticides based on pest and disease characteristics. Every pest has its harmful properties. Control chewing mouthparts pests that harm the leaves (such as various caterpillars) to choose stomach poisons or contact agents; control sucking mouthparts pests (such as aphids, black thorns, scale insects, etc.) to choose a systemic insecticide For the prevention and treatment of dried pests (Echinian, Gypsophila), it is necessary to choose a pesticide with strong fumigation effect.
3. Select pesticides according to the law of occurrence of pests and diseases. In the initial infection period of the disease, a fungicide with a protective effect is selected, and when the pathogen invades the host crop, a systemic fungicide is selected. Some diseases have the characteristics of long infection period and latent infection, and it is necessary to choose a fungicide with both therapeutic and protective effects.
4. Select pesticides based on the biological characteristics of the pests and diseases. In the prevention and control of wintering pests in the soil, selective insecticides should be selected for spraying on the ground during the spring unearthing period. In the adult spawning period, insecticides with both contact and stomach toxicity should be selected. The agent is used to control the pests of the cockroaches, and the fumigant is used in the larval stage, and is applied to the sputum, and the contact agent is sprayed on the trunk during the adult or egg stage.
5. Select pesticides according to the characteristics of the pesticide. All kinds of pesticides have a certain scope of application and applicable period. Some pesticide varieties are sensitive to temperature response. For example, the control effect of alkyne in the summer with higher temperature is significantly higher than that in the spring with lower temperature. Some pesticides are effective for a certain stage of development of pests, and other stages are less effective. For example, thiazolone has a good effect on eggs of mites, but has a poor effect on active mites; insect growth regulators such as chlorpyrifos Insecticides have a good effect only when used in young larvae.
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