Grubs are the main insect pests in the process of blueberry cultivation. They mainly occur in the root system of blueberries and keep gnawing. The blueberries eaten by grubs will turn yellow at first, and eventually the branches and leaves will dry up and die. They will also induce root rot, which will cause great harm to blueberries. So how to prevent and control grubs? Let's take a look.
1. How to identify grubs.
Grubs mainly harm the root system of plants. They are generally invisible when they break out, so we must first identify them. First, look at the blueberry tree. After the grubs bite the blueberry fibrous roots, the plant will soon become dehydrated. The leaves will turn yellow in the early stage and dry up in the later stage. In this way, the possibility of being harmed by grubs is very high. Then look at the roots. In severe cases, only the main root is left after being bitten. Then look for grubs. When there are the above two symptoms, cut open the root soil, and you can often find grubs at that time.
2. How to carry out agricultural prevention and control
During winter pruning every year, cut off diseased branches and insect branches, remove weeds, and fertilize in autumn and winter. Deeply plow the soil 20 cm, increase the number of plowing, deep plowing and harrowing, and intensive cultivation. This can eliminate a large number of overwintering larvae. After that, strengthen fertilizer and water management, increase the application of phosphorus and potassium fertilizers and micro-fertilizers, promote the growth of blueberries, and improve the ability to resist pests. Remember not to apply farmyard manure that has not been completely rotted and fermented.
3. How to carry out physical prevention and control
Physical prevention is mainly to prevent the mating and egg laying of adults. At this time, the key to preventing and controlling grubs can be used to kill with insecticidal lamps, sugar and vinegar liquid, artificial capture, and poisonous soil. These methods can effectively prevent and control grubs.
4. How to carry out biological control
Currently, biological agents for the control of grubs include Beauveria bassiana, Metarhizium anisopliae, Bacillus thuringiensis and Paecilomyces lilacinus. Among them, Beauveria bassiana and Metarhizium anisopliae are one of the most ideal agents for the control of grubs, which are highly efficient, non-toxic and pollution-free.
Next time we will talk about how hashtag#Beauveria bassiana works.
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