When it comes to Myzus persicae, imidacloprid, pymetrozine, acetamiprid and nitenpyram are used alone. It is basically impossible. Some places that are not difficult to fight are all mixed or mixed. There seems to be no place to deal with it well, and this is a special case in an era when resistance regionalization is particularly obvious.
There seems to be no cheap product to control scale insects after the use of methidathion on fruit trees was banned in the previous two years. Chlorpyrifos is used instead of methidathion. Now, due to the problem of drug resistance, the dose is gradually increasing, and the effect of methidathion cannot be achieved.
All kinds of fruit eaters, such as Momo, big peach, small pear, big pear, small apple and big apple, are hard to control at present. In fact, moths were well controlled before drilling, but it was really difficult to control after drilling. This is not to say that there is no resistance before drilling, but the resistance is already obvious.
I believe everyone knows how to control pear psyllid with abamectin and spirotetramat. It is said that avermectin is resistant, and farmers basically know it, but many people may not notice the resistance of spiromesethyl. Especially after the patent of snail ethyl ester expires and a large number of domestic snail ethyl esters are listed, the evolution of this resistance will be further accelerated.