When controlling pests, we always hope to have a way to kill pests quickly and thoroughly. However, the facts tell us that this "magic medicine" is out of reach. For example, the chlorfenapyr shared with you today has both contact and stomach poison effects, and can kill insects in as fast as one hour, but it also has its own shortcomings. Next, let us re-understand chlorfenapyr.
1. About chlorfenapyr
Chlorfenapyr is a new type of pyrrole insecticide, acaricide, and nematicide, which has contact and stomach poison effects and a certain systemic effect. Its mechanism of action is to act on the mitochondria of cells in the pest body, block its oxidative phosphorylation, and destroy the energy production process in the cell, so as to achieve the purpose of killing pests by causing cell failure. The insecticide speed is fast and the duration is medium.
Mainly microemulsions with an effective content of 10% and 20%, suspensions of 10%, 21%, 30%, 100 g/L, 240 g/L, 360 g/L, and 50% water-dispersible granules, etc.
2. Three major characteristics
(1) High efficiency and broad spectrum. Chlorfenapyr can control a variety of pests such as diamondback moth, beet armyworm, armyworm, striped stem borer, yellow stem borer, rice leaf roller, cabbage borer, cabbage worm, cotton bollworm, leafminer, thrips, and cabbage aphid. It can be used on cruciferous vegetables such as Chinese cabbage, Chinese cabbage, kale, and kale, melons and solanaceous vegetables such as cucumber, wax gourd, and eggplant, fruit trees such as apples and pears, and economic crops and trees such as tea trees and poplars. It can also be used to control pests and mites that are resistant to organophosphorus, carbamate, and pyrethroid insecticides, and has good effects.
(2) Good rapidity. Chlorfenapyr has stomach poison and contact killing effects on pests. It also has good permeability and certain systemic conductivity. It kills insects quickly. Generally, pests can be killed within 1 hour after application, and the peak of dead insects is reached within 24 hours. The control efficiency on the same day is more than 85%.
(3) Good compatibility. Chlorfenapyr is a new type of pyrrole insecticide. It has no cross-resistance with the mainstream insecticides on the market. It can be mixed or used alternately with multiple insecticides such as emamectin benzoate, avermectin, indoxacarb, lufenuron, spinetoram, methoxyfenozide, etc. When mixed, the synergistic effect is obvious, which not only expands the insecticide spectrum, but also significantly improves the efficacy and slows down the development of insecticide resistance in pests.
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3. Two major shortcomings
Although chlorfenapyr has performed well in preventing and controlling lepidoptera and other pests after it was launched on the market, due to cost-effectiveness and resistance development, it has also brought some adverse effects to the market promotion of chlorfenapyr. However, the main reasons why many people are unwilling or dare not use chlorfenapyr rashly are the following two aspects:
(1) It has no egg-killing effect. Fenpyraclostrobin can be used to control many types of pests such as Lepidoptera, Homoptera and mites. It is especially effective against adult Lepidoptera pests, but it has no control effect on insect eggs. When it is actually used, the following situation may occur: after using Fenpyraclostrobin, the existing pests may be killed quickly, but after about a week, the eggs will hatch and a new wave of pests will appear, which will continue to harm crops. This also gives people the illusion that Fenpyraclostrobin is "incomplete" in killing insects.
(2) High risk of pesticide damage. Melon crops such as watermelon, melon, cantaloupe, loofah, bitter melon, hanging melon, winter melon, pumpkin, and zucchini are relatively sensitive to Fenpyraclostrobin. If used improperly, they are prone to pesticide damage. Cruciferous crops such as cabbage, radish, kale, and rapeseed are also prone to acute pesticide damage symptoms such as yellow spots, leaf burning, flower burning, and leaf shrinkage and curling when Fenpyraclostrobin is used before 10 leaves. This greatly increases the threshold for using Fenpyraclostrobin.
4. Usage
(1) To control beet armyworm, tobacco budworm, bean pod borer, etc. on crops such as corn, peanuts, and soybeans, 30-50 ml of 10% chlorfenapyr suspension can be used per mu; to control beet armyworm, tobacco budworm, cabbage budworm, etc. on vegetable crops, 500 times of 10% chlorfenapyr suspension can be sprayed; to control fruit borers, leaf miners, thrips, etc., 2500-3500 times of 10% chlorfenapyr suspension can be used and sprayed evenly.
(2) Since chlorfenapyr has no ovicidal effect, but has a good effect on larvae and adults, and has good rapid effect, it is recommended to use it during the high-incidence period of pests to achieve the purpose of quickly killing pests and reducing the base number of insects; at the same time, in order to achieve a longer lasting effect, it can be used in combination with agents with ovicidal function, such as lufenuron and pyriproxyfen.
(3) When using chlorfenapyr, in order to improve the control effect and delay the development of pest resistance, try to mix it with other pesticides or use its mixed products, such as abamectin·chlorfenapyr, chlorfenapyr·chlorfenapyr, chlorfenapyr·indoxacarb, and multidose·chlorfenapyr.
Precautions
(1) In order to avoid pesticide damage, try not to use chlorfenapyr on cucurbitaceous crops such as watermelon, melon, loofah, pumpkin, zucchini, and cruciferous crops such as cabbage, radish, and rapeseed, especially during high temperature, flowering period, and seedling stage; once pesticide damage occurs, it should be promptly alleviated with regulators such as brassinolide, gibberellin, and humic acid and amino acid foliar fertilizers.
(2) Use it at most twice per crop season, otherwise it is very easy to develop pesticide resistance and the control effect will be significantly reduced.
