How are plant aphids produced?

aphids may be caused by climatic factors, or by the decrease in the number of natural enemies of aphids. Aphids have strong reproductive ability, and can reproduce 1 ~ 3 generations a year, and the overlapping phenomenon of generations is prominent. Moreover, aphids can reproduce very early, and female aphids can be pregnant and have children at birth.

What are aphids

Aphids are also called bored worms, early worms, honey worms, ant worms and so on. Although their bodies are small, they can do great harm to plants.

Among them, except the gallnut aphid, all of them are destructive pests.

Aphids use their needle-like mouthparts to stab people's tissues and suck the juice of plants, causing the injured plants to curl their leaves, wither and even die in severe cases.

Causes of aphids

1. Weather causes aphids to occur

Higher temperature and less precipitation, and lower relative humidity are very beneficial to the occurrence and reproduction of aphids, among which the optimum temperature for aphids is 24-28℃ and the optimum relative humidity is 5-85%.

Generally, aphids usually breed in 3-5 days, and one aphid can breed 5-7, which is difficult to control.

2. Seasonal factors

The main activity time of aphids is from mid-April to late September, and some adults of aphids can fly. Sometimes it will spread with people, and some will spread with the wind. As long as potted plants are suitable for aphid growth, they will soon reproduce.

3. The decrease in the number of natural enemies leads to the occurrence of aphids

In recent years, due to the large amount of pesticides sprayed in agricultural production, the number of seven-star floating insects has decreased, and the number of natural enemies has decreased, which can not control the spread of aphids, which is the main factor leading to the occurrence of aphids.

4. Color

The ability of aphids to recognize colors is different from that of human eyes. Aphids have a positive tropism for yellow light and a negative tropism for silver-gray light.

how to prevent and treat crop aphids

1. Manual control

We can use high-pressure water spraying to kill or wash away a large number of aphids. In case of drought in spring, we can use the opportunity of supplementing water to control the density of insect population and reduce the occurrence of aphids. However, it is best to spray water continuously in a season to achieve the desired effect.

2. Biological control

Pay attention to the protection and utilization of natural enemies of aphids. The natural enemies of aphids mainly include ladybird, Harmonia axyridis, Chrysopa sinica, syrphidae and so on.

We can use artificial migration of natural enemies such as ladybugs and syrphids, and also carry out effective control.

3. Chemical control

There are many chemical control methods for aphids, and the proportion of drugs used in different places is also different. Some of them are injected or buried in the trunk and roots of trees for prevention and control, mainly by spraying drugs on the crown, and the effect is also remarkable.