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Effects of mixture of abamectin and pesticide on common pests

Posted at September 19, 2014 | By : | Categories : Company News | Comments Off on Effects of mixture of abamectin and pesticide on common pests
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After measuring the joint action of mixture of abamectin and three kinds of pesticides including chlorpyrifos, hexaflumuron and petroleum spray oil (PSO) on cotton bollworm., it can be seen that according to the effect of siple dosage, abamectin insecticide has highest toxicity ((LD50 is 3.241×10-2-2~4.247×10-2μg/insect) on the 4th instar larvae of cotton bollworm, followed by hexaflumuron ((LD50 is 8.058×10-1μg/insect) and chlorpyrifos has the lowest toxicity (LD50 is 615.0181μg/insect), however, PSO almost has no activity on the larvae of cotton bollworm, of which the LD50 is more than 6083μg/insect. The toxicity of the former three drugs on cotton bollworm varies by1-4 order of magnitudes. By analyzing the mixture, the cotoxicity coefficient (CTC) of “abamectin+ chlorpyrifos (1:100)”, “abamectin+ hexaflumuron (1:5)” and “abamectin+ PSO (1:165)” respectively reaches 179.0, 253.3 and 420.0, therefore, they all have synergism. Among them, the former mixture will have weak synergism, while the latter two mixtures will have obvious synergism.

After blending abamectin pesticide with methamidophos under different proportions, the cotoxicity coefficient of six mixed combinations (abaemctin:methamidophos 1:99) is 80.20-104.12 (all are in the range of 70-150), therefore, it will have additive action on cotton bollworm.

By blending abamectin with alphacypermethrin, all the three matching will have synergism on diamondback moth. Among them, the matching of 1:3.7 will have weak synergism (CTC is 165.53), while the matching of 1:3.1 and 1:2.7 will both have obvious synergism (CTC respectively reaches 386.53 and 231.15). Among the three matching of abamectin and cyhalothrin, the matching of 1:13.3 will have additive action ((CTC is 133.80); while the matching of 1:19.0 and 1:32.3 will have weak synergism (CTC respectively reaches 175.58 and 177.39).

By blending abamectin with fenpropathrin in three matching (1:15.7, 1:124 and 1:49), CTC of diamondback moth all reaches more than 200, therefore, it will have obvious synergism; however, by blending abamectin with phoxim in three matching (1:165.7, 1:124 and 1:1.99), CTC are all in the range of 150-200, therefore, it will have certain synergism.

By blending abamectin with moncrotophos, different mixed combinations will have different joint action. The matching of 1:99 and 1:65.7 will have additive action (CTC respectively reaches 75.09 and 144.58); while the matching of 1:199 will have antagonism (CTC is only 34.10). Similarly, by blending abamectin with diazinon, the matching of 1:165.7 and 1:249 will have additive action (CTC respectively reaches 85.38 and 119.40), while the matching of 1:499 will have antagonism (CTC is only 59.87).

After measuring the joint action of the mixture of abamectin and esfenvalerate on serpentine leafminer, the cotoxicity coefficient of three matching (1:11, 1:3 and 1:5) is in the range of 150.77-180.70, therefore, it will have weak synergism.

After measuring the joint action of mixture of abamectin and lmidacloprid on bemisia tabaci, the cotoxicity coefficient of matching (1:20) on imago and nymph are respectively as 139.72 and 108.28, therefore, it will have additive action.

After measuring the joint action of the mixture of abamectin and azocyclotin or fenpropathrin on Panoychus citri McGregor, among the six mixed combinations of abamectin and azocyclotin, the matching of 1:43 and 1:24.1 will have obvious synergism (CTC is more than 200), while the matching of 1:87, 1:34.2, 1:28.3 and 1:17.3 will have additive action (CTC is in the range of 98.32-145.48). The three mixed combinations of abamectin and fenpropathrin will all have synergism, among which the matching of 1:300 will have weak synergism (CTC is 172.26), while the matching of 1:100 and 1:150 will have obvious synergism (CTC respectively reaches 225.66 and 309.50).

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