aerial spraying

Dendrolimus punctatus Control by Aerial Spraying of Ultralight Helicopter

应用超轻型飞机防治马尾松毛虫试验研究

Study on controlling Dendrolimus superans using avermectin by aerial spraying

利用M-18型飞机喷洒高效生物药剂防治落叶松毛虫的研究

Paper here deals with the conditions, mechanism, effects and profits of the yield increases of herbages and the influences concerning main mineral nutrients by aerial spraying of urea and zinc sulfate solutions.

本文研究了飞机喷洒尿素、硫酸锌对牧草增产的有效条件、增产机理、增产效果、经济效益，以及喷洒肥液对主要矿质养分的影响问题。

Only when its biology was understood and chemical pesticides and aerial spraying became available a few decades ago, could efforts be made to control the insect.

只是在几十年前认识了其生物性，有了化学杀虫剂和空中撒药之后，人们才开始努力控制这种虫害。

And to lower the risk of infection, some areas have taken extreme measures, including aerial pesticide spraying.

为了降低感染率，一些地区甚至采取了极端的措施，即在空中喷洒杀虫剂。