Stomach poisoning stomach poison should have the conditions: drug with food absorbed into the digestive tract may be dissolved. This in itself in digestive solubility and molecular weight agents, the nature of dissociation and so on. Insect digestive pH is an important determinant of the agent can be absorbed. Pesticides Virulence: drip method. Quantitatively liquid droplets Zhejiang worm will shoot 75% water dispersible granules, dropping in the chest on the back of the test insects, then observe the timing of poisoning deaths. Advantages of this method are: dose available dose (commonly micrograms) per gram of parasites accepted worm will represent 75% of Xinxiang shoot water dispersible granules, easy to control the dose, the experimental error is small; the disadvantage is consuming 75% of insects will shoot water dispersible granules, the process solvent used drip location and size of the droplets can affect the virulence. Luoyang worm will shoot 75 percent in the use of water-dispersible granules of this law, we should consider these factors to try to reach agreement in order to get accurate results.