Toxicity Test of Different Fungicides and Compound Formulations to Alfalfa Rust
In order to select effective fungicide for the control of alfalfa rust,14 kinds of fungicides toxicity were measured using potted plant and spray method to study the synergitic effect,and 6 kinds of fungicides of mixed formulation were selected.The test results indicated that Azoxystrobin had the strongest toxicity to alfalfa rust and EC50 was 1.8809 mg · L-1,Thiophanate-methyl had the weakest toxicity and EC50 were 747.0022 mg · L-1.According to the different mechanisms of fungicides,the 1 ∶ 9 formulation of Azoxystrobin mixed with Tebuconazole produced an additive effect,the 5 ∶ 1 formulation had the strongest synergistic effect and efficiency coefficient was 4.9684.The 1 ∶ 3 formulation of Azoxystrobin mixed with dimethomorph produced the strongest synergies and efficiency coefficient was 5.1114,but 9 ∶ 1 formulation produced antagonism effect.The 1 ∶ 7 formulation of Azoxystrobin mixed with mancozeb produced obvious synergies and efficiency coefficient was 4.5757.The 1 ∶ 5 formulation of Pyraclostrobin mixed with difenoconazole produced the strongest synergy effect and efficiency coefficient was 5.2276.The 1 ∶ 7 formulation of Pyraclostrobin mixed with chlorothalonil produced obvious effect and efficiency coefficient was 5.8058.
Alfalfa rustFungicideSelectingMixtureToxicity test
NETL
NSTL
万方数据
维普
