The application of biogenic pesticides to control vegetable pests, reduce the pollution of exogenous chemical harmful substances and pesticide residues exceed the standard, is one of the important measures for the production of pollution-free vegetables. In order to adapt to the situation, the development and utilization of bio-sourced pesticides have made significant progress today, and field application techniques for applying insecticides to these pesticides are maturing. The prevention and application technologies of the main pests of vegetables and the biogenic pesticides mainly composed of plants and microorganisms are described as follows: Pieris rapae: The initial stage of prevention and control is that of adult worms before the low-(2nd-instar) instar larvae after the oviposition period of adults. The pesticide used was: 11.8% avermectin EC, with 11-22 ml/mu. 23.5% rotenone emulsion, applied 1000 times. 30.1% Oxymatrine aqueous solution, 60-80 ml per mu. 48,000 units of Bacillus thuringiensis (BT) wettable powder applied 50 to 100 grams per mu. 50.5% alizarin EC, 50-100 ml per mu. 60.5% soluble veratrine solution, 75-100 ml per acre. 7 Each milligram contains 10,000 units of cabbage worm granule virus preparation, applying 50-75 grams per acre. 8 Bacillus thuringiensis suspension containing 10 billion live spores per ml, 100-150 ml per mu. 93% pyrethrin EC, 50 ml per mu. 100.3% hyperosmotic avermectin EC, 20-40 ml per mu. Plutella xylostella: The beginning of control was the period of the seedling stage of the damaged vegetable, the second instar larva stage, or the hatching of the egg. The pesticides used were: 1 Bacillus thuringiensis suspension containing 10 billion viable spores per ml and 100-150 ml per mu. 28,000 units of Bacillus thuringiensis WP, 100-150 g per mu. 32.5% doxorubicin suspension, 35 to 70 ml per mu. 41.8% avermectin EC, 22~33 ml per acre. 5 per gram containing 4 billion units of Plutella xylostella granulovirus WP, 150-200 grams per acre. 60.3% matrine aqueous solution, 500-700 ml per mu. 70.3% azadirachtin EC, 50-80 ml per mu. 80.2% hyperosmotic methyl avermectin EC, 50-60 ml per mu. 91.1% Bai Juyan EC, 60-75 ml per mu. 105% natural pyrethrin aqueous emulsion applied 1000-2000 times. Vegetable worms: The initial stage of prevention and control is the initial occurrence of spotless aphids. The pesticide used was: 15% pyrethrin EC, 30-50 ml per mu. 210% nicotine EC, 30-45 ml per mu. 30.3% matrine aqueous solution, 60-150 ml per mu. 47.5% rotenone emulsion, 35 ml per mu. 520% compound Liuyangmycin EC, 1000 times solution. 60.65% of artemisinin water, applied 250 to 300 times solution. 7 virulent fungi, applied 40 times. 80.88% dual-alkali aqueous solution, 100-150 ml per mu. Spodoptera exigua: The initial period of prevention and control is the period after the emergence of adults, and the larvae are mostly before the peak age of 2 years. The pesticide used was: 10.5% Emamectin Microemulsion, 20-30 ml per mu. 21.5% Emamectin EC, 10 to 18 ml per mu. 30.3% matrine aqueous solution applied 200 to 300 times. 4 Contains 1 billion units of S. parasitoid nuclear polyhedrosis virus suspension per ml, applying 100 to 150 ml per mu. 515000 units of Bacillus thuringiensis water dispersible granules, 25-50 grams per acre. 64000 units of Bacillus thuringiensis EC, 250 ml per mu. 7 containing 1 billion units of Spodoptera exigua nuclear polyhedra virus agent per ml, 40 to 80 ml per mu. 72.5% doxorubicin suspension agent, 50 to 100 ml per mu. Red spider: The initial stage of control is the initial occurrence of red spiders. The pesticide used was: 110% Liuyangmycin EC, with 50-100 ml per mu. 21.8% avermectin EC, 30-40 ml per mu. 32% azadirachtin cream, applied 1000 ~ 2000 times liquid. 40.5% veratrine alcohol solution, applied 2000 times. Whitefly: The initial stage of prevention and cure is the establishment of vegetable seedlings and a small amount of adult emergence. The pesticide used was: 10.9% avermectin EC, applied 2000 times. 22% azadirachtin EC, applied 200 to 800 times. 33.5% rotenone emulsion was applied 1000 times. Liriomyza sativae: The initial stage of control is the spawning period of egg fly or egg hatching. The pesticide used was 2% avermectin EC, with 15 to 25 ml per mu.è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬ è›´èž¬. Select pesticides: 11.1% matrine powder, apply 2.0 to 2.2 kg per acre. 2 Nematode suspension of nematodes, with 100 to 200 million nematode doses per mu. 3 250 g per mu for each gram of Bacillus chrysogenum containing 100 million spores. 4 Beauveria bassiana containing 1.5 to 2 billion spores per gram, 2.5 kg per mu. Bio-sourced pesticides applied to vegetable products despite the safety of food. However, after all, it has the disadvantages of bio-sourced pesticides: the insecticidal effect is low, the effect is slow, the performance is simple, and the cost is high. Therefore, it is very important to maximize the effectiveness of such pesticides and make up for the insecticidal defects. The necessary precautions to maximize efficacy are introduced as follows: 1) The initial phase of prevention must be mastered. When the opportunity is missed, the resistance of pests will increase and the effectiveness will be poor. In general, 2 to 3 days ahead of the experience of chemical pesticides. 2) Must avoid the degraded photolysis environment. The application of pesticides should be avoided during direct sunlight, preferably in the early morning, evening or cloudy days. 3) It is necessary to use the dosage per mu/mu (the amount of liquid) to stabilize the insecticidal effect of the pesticides. Avoid reducing effectiveness again and again. 4) The insect pests must be applied evenly and thoroughly. This type of drug is mostly non-absorbent. When spraying, it is necessary to understand the habitat of harmful insects and spot the target for full spray protection. 5) Must pay attention to the continuous spraying of intervals. According to conventional practice, pests should be sprayed 2 or 3 times continuously during the generation of pests. Biologically-derived pesticides are even more important, and these drugs show a continuous spraying of insects. 6) It must be clarified that the insecticides of these pesticides are slow, and they must wait patiently for insect repellent effects. They must not use the insecticide concept of chemical pesticides to despise them.
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