1. organic sulfur fungicides mancozeb represented pesticides organosulfur fungicides, pesticides broad spectrum protective fungicides. The mechanism of action is to inhibit the oxidation of pyruvate and the spore germination of the bacteria in the bacteria, and prevent the invasion of the bacteria. In addition to being effective against powdery mildew, this kind of agent has a preventive effect on most diseases of strawberry. Such agents are not easy to produce resistance, but have little killing effect on mycelium invading plants, and the dosage is relatively large. Protective pesticide fungicide.
2. Benzimidazole fungicides
Benzimidazole pesticide fungicide represented by carbendazim is a high-efficiency, low-toxic, broad-spectrum systemic pesticide fungicide with dual effects of treatment and protection, and has strong inhibitory effect on strawberry powdery mildew. . The main mechanism of action is to interfere with the formation of spindles in the mitosis of pathogens, thereby affecting cell division. Since most of the varieties of such agents, such as benomyl, thiophanate, and thiophanate-methyl, are finally converted into common antibacterial toxic carbendazim after application on strawberries, long-term use is prone to drug resistance.
3. Triazole pesticide fungicide
The application of triazole pesticides in the control of strawberry powdery mildew has brought the chemical control technology of powdery mildew into a new era. The mechanism of action is to inhibit the biosynthesis of the ergosterol, which is also known as the biosynthesis inhibitor of ergosterol, which disrupts the function of the cell membrane and thus interferes with the growth of mycelium and sporulation. These agents have the characteristics of high efficiency, broad spectrum, low residue, long duration of action, strong systemic absorption, and protection, treatment, eradication and fumigation. The main types of such pesticide bactericides are triadimefon, myclobutanil, tetrafluoroetherazole and the like. The application of triadimefon in the control of strawberry powdery mildew has achieved good control effects at the beginning, but the powdery mildew has gradually developed resistance to triazolone after long-term use, and the phytotoxicity and inhibition of triadimefon on strawberries. It is becoming more and more obvious.
Myclobutanil and tetrafluoroetherazole are new generation triazole pesticide fungicides developed after triazolone. The two agents are more potent than triadimefon, have less dosage, are safer, and have less inhibitory effect on strawberries, and are currently the most widely used triazole agents in strawberry production. Both fenflurazole and tetrafluoroetherazole were superior to triazolone in both therapeutic and protective effects.
4. Imitation biological plant source fungicide
The application of this kind of pesticide fungicide in the prevention and control of strawberry powdery mildew is a major breakthrough in chemical control technology. Their characteristics: safe and pollution-free, safe for strawberry flowers and fruits, and have no inhibitory effect on growth. The main varieties of such pesticide bactericides include azoxystrobin, dilute bacillus, ether bacillus and the like. The world's use of azoxystrobin is the largest, the mechanism of action is to inhibit mitochondrial respiration, destroy the energy synthesis of the bacteria, thereby inhibiting mycelial growth, sporulation and germination. The pesticide bactericide has the characteristics of high efficiency, broad spectrum, low residue, and promotion of strawberry growth, and has the functions of prevention, treatment, eradication and inhibition of spore production. It has no cross-resistance with pesticide antibacterial agents such as triazole fungicides, diimide fungicides, benzimidazoles and anilines, and is the best agent for replacing triazole pesticides.
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