Application of pyrethrin in preventing and controlling Aleurodicus disperses Russell and pyrethrin synergistic composition
A technology of pyrethrin and spiral whitefly, which is applied in the field of pyrethrin in the control of spiral whitefly, botanical insecticide, and pyrethrin synergistic compound
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Embodiment 1
[0028] Example 1 The preparation method of 5% pyrethrin emulsifiable concentrate preparation:
[0029] Measure 1.0 ml of 50% pyrethrin crude oil (the pyrethrin crude oil in this example was purchased from Yunnan Nanbao Phytochemical Co., Ltd., mainly containing pyrethrins I (pyrethrin I) and pyrethrins II (pyrethrin II), and their contents are respectively 26.50% and 23.04%) in a 15ml stoppered test tube, add 8ml cyclohexanone and stir until dissolved, then add 1ml Nongru 0206, shake well to get 5% pyrethrin EC preparation.
[0030] Determination of the poisonous effect of 5% pyrethrin emulsifiable oil on screw whitefly adults:
[0031] Dilute 5% pyrethrin EC with water to 5 concentrations of 0.25, 0.5, 1.0, 2.0 and 4.0ppm. Take terminalia leaves and cut them into leaf discs with a diameter of d=7cm, put them into a petri dish (diameter d=7cm) lined with moist filter paper, insert 30 to 35 adults of the spiral whitefly, and put the inoculated petri dish into In the spray t...
Embodiment 2
[0033] Example 2 Preparation method of pyrethrin synergistic compound
[0034] Weigh 6g of soap (commercially available) in a 100ml beaker, add 34g of water, heat on an electric stove, stir while heating to completely dissolve the soap, then add 14g of kerosene, stir well to obtain a kerosene-soap mixture;
[0035]Take 1 part of the kerosene soap mixture (volume ratio), mix it with 20 parts of water, and stir it thoroughly, and use it as solution A; take 1 part (volume ratio) of the 5% pyrethrin EC preparation, mix it with 1000-2000 parts of water, and stir it fully , as solution B; mix equal volumes of the two solutions A and B to obtain the pyrethrin synergistic complex.
Embodiment 3
[0036] Example 3 Determination of the poisonous effect of 5% pyrethrin emulsifiable concentrate preparation mixed with different concentrations of kerosene and soap mixture on adults of screw whitefly
[0037] The ratio of pyrethrins mixed with different concentrations of kerosene and soap is shown in Table 1. The spray method of Example 1 is used to measure the synergistic effect of pyrethrins on the mixing of different concentrations of kerosene and soap to adults of screw whitefly. Test see attached results figure 2 .
[0038] Table 1 The proportion of pyrethrin mixed with different concentrations of kerosene and soap
[0039] deal with A A+B2 A+B2+C1 A+B2+C2 A+B3+C2 A+B1+C2 A+C2 CK Pyrethrin concentration (ppm) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0 Kerosene concentration (%) 0 0.6 0.6 0.6 1.0 0.25 0 0 Soap concentration (%) 0 0 0.15 0.25 0.25 0.25 0.25 0
[0040] From attached figure 2 It can be understood ...
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