Rose spider mites get worse after spraying, and the truth is speechless

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• Rose cultivation series articles: Article 91

As summer is about to arrive, the peak season for rose pests and diseases is coming soon. Many flower lovers' roses have even already been attacked by pests and diseases. Today Blue Demon will not talk about the prevention and treatment of pests and diseases. Blue Demon has already shared this content in detail in previous articles. Today what Blue Demon wants to talk about is how we should correctly use pesticides when facing pests and diseases.

Why do roses not improve after spraying, but instead get worse?

We often talk about the prevention of pests and diseases, so many beginner flower lovers treat pests and diseases as the same thing. In fact, what we call pests and diseases should include two completely different situations.

Pests and diseases are divided into diseases and insect pests. The two are fundamentally different, and the pesticides used are naturally different as well.

Flower lovers often ask Blue Demon about rose pest and disease problems, and Blue Demon also often encounters such problems:

When a flower lover sends me a photo to ask about a rose problem, I tell him it is rose black spot disease, and then he follows up by asking me: "I sprayed Baichongling, but it had no effect?"

There are also flower lovers who, when Blue Demon tells them that the rose has spider mites, tell me that they have already sprayed pesticide, but it just does not improve and instead gets worse. When asked what pesticide they used, it turns out they sprayed carbendazim.

Just as flower lovers in the reader group say, not distinguishing between diseases and insect pests and using pesticides indiscriminately is really not an isolated case. Blue Demon also feels it is time to popularize the difference between diseases and insect pests.

What is the difference between diseases and insect pests?

What is disease?

It refers to a series of pathological changes in morphology, physiology and biochemistry of plants under the influence of biological or abiotic factors, which hinder normal growth and development, and even show abnormal pathological phenomena in external morphology, such as wilting, rotting, spots, mold powder, mosaic leaves, etc., collectively called disease.

What are insect pests?

Simply put, they are animals that harm plant growth or production, mainly insects, as well as mites, snails, rodents, etc.

To give a simple example: disease is like when we get sick and have a fever, and the source of infection is invisible bacteria, pathogens and the like, while insect pests are like mosquitoes, wasps and other external small animals that bite us.

Knowing this difference, when we treat pests and diseases, we should know that the pesticides used for diseases and insect pests are completely different.

Pesticides for diseases:

Diseases are mostly caused by infection from bacteria and pathogens. For pesticides, bactericidal agents are mostly used, such as medicines with the character for bacteria in their names, chlorothalonil, carbendazim, etc.

Of course, many fungicides do not have the character for bacteria in their names. We can look at the instructions. Those written as broad-spectrum antibacterial drugs can all be used to treat diseases.

This is the general principle for disease pesticides. Of course, the pesticides used for different diseases will differ slightly, but if the general direction is right, there will generally be some effect, and targeted pesticide use can be more effective.

Pesticides for insect pests:

For insect pests, insecticides should be used, such as Baichongling and Tuchongdan. These names with the character for insect are all insecticides. Some acaricides mostly have the character for mite in their names, such as: pyridaben, abamectin, propargite, etc.

Some insects need targeted pesticide use. For example, green caterpillars that chew leaves need pesticides for killing green caterpillars. Very small insects can generally be killed with imidacloprid, and mite pests need acaricides.

Although the specific pesticides used will differ, Blue Demon hopes everyone can understand that diseases and insect pests are fundamentally different. We should fully recognize this before treatment, and only then can treatment be effective.

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