Introduction to Common Diseases and Pests of Roses and Control Methods
This article provides a detailed introduction to the green plant related content about the common diseases and pests of roses and their control methods. Let's follow the editor to take a look!
The temperature has dropped significantly in the past two days, coupled with continuous cloudy and rainy weather, which makes people feel the strong autumnal atmosphere. Autumn temperatures are very beneficial for the growth of roses, and as autumn sets in, roses will bloom more beautifully. However, autumn is also a high-incidence period for pests. In the rose wall construction camp, some gardening enthusiasts have found that the leaves of roses have developed a large number of spots in a short time. Upon closer inspection, it turns out that the leaf flesh has been eaten away.
So, what kind of insects are responsible for this? Today, let's talk about the common rose pests in autumn.
1. Green Caterpillars - Green caterpillars are very common pests in summer and autumn. There are many specific types of green caterpillars, mainly the larvae of moths or butterflies, which all look similar, some are green, some are black, some are gray, and some are good at camouflage. They mainly harm the leaves of roses, eating the leaves or leaf flesh. We collectively refer to these larvae of moths and butterflies as green caterpillars.
Green caterpillars are highly prevalent in autumn. The pest mentioned at the beginning of the article, found in the rose wall construction camp, was a larva of a nocturnal moth. Although the caterpillar is small, the number is large, so the damage is considerable.
The control of green caterpillars mainly involves spraying drugs. Preventive treatments can use acetamiprid, which has good contact killing and feeding poison effects and can be absorbed by roses, with a continuous effective period of up to 25 days.
For roses already affected by green caterpillar pests, in the early stage of infestation, during the larval stage, acetamiprid or Bacillus thuringiensis can be sprayed to kill the pests. Bacillus thuringiensis is a type of microbial bacterial medicine with relatively low toxicity, safe and environmentally friendly. However, when using Bacillus thuringiensis, it is best not to use it together with fungicides, as it can result in the loss of efficacy.
2. Thrips
Introduction to Common Diseases and Pests of Roses and Control Methods
In autumn, thrips are also very common and may show explosive development. Even if thrips control has been done in summer, it is still easy to appear in autumn and cannot be ignored.
The symptoms of thrips mainly include deformation of new buds and leaves of roses, with black burnt tips. If your roses show the above symptoms, please immediately spray acetamiprid for treatment.
If you have been using acetamiprid for a long time, the effect may decrease, as there may be resistance. In this case, dinotefuran or Ailvshi can be used, which may have better effects.
Thrips are relatively concealed, staying hidden during the day and active at night, making them difficult to see. Green plant enthusiasts recommend that you base the diagnosis on symptoms and apply the medicine immediately when thrips pest symptoms appear. Spraying the medicine in the evening can yield better results.
3. Grasshoppers