1、使用浓度。用液剂喷雾时,往往需用水将药剂配成或稀释成适当的浓度,浓度过高会造成药害和浪费,浓度过低则无效。有些非可湿性的或难于湿润的粉剂,应先加入少许,将药粉调成糊状,然后再加水配制,也可以在配制时添加一些湿润剂。2、喷药时间。喷药的时间过早会造成浪费或降低防效,过迟则大量病原物已经侵入寄主,即使喷内吸治疗剂,也收获不大,应根据发病规律和当时情况或根据短期预测及时把在没有发病或刚刚发病时就喷药保护。3、喷药次数。喷药次数主要根据药 1, the use of concentration. With liquid spray, often need to use water to dilute the drug dubbed the appropriate concentration, the concentration is too high will cause injury and waste, the concentration is too low is invalid. Some non-wettable or difficult to wet powder, you should first add a little, the powder into a paste, and then add water to prepare, you can also add some wetting agent in the preparation. 2, spraying time. Spraying time is too early will result in waste or reduce control effect, too late a large number of pathogens have invaded the host, even if the spray absorption of the therapeutic agent, but also little gain, should be based on the incidence and the prevailing circumstances or short-term forecast in a timely manner No incidence or just when the disease on the spray protection. 3, spraying times. The number of spraying mainly based on drugs