After spraying, roses turn into a blotchy mess - keep these precautions in mind
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This is day 882 of Lanyao's daily original articles
Rose growing series articles: No. 80
Recently, the weather has been getting hotter and hotter, and many rose pests and diseases have begun to break out, such as red spider mites, flower thrips, black spot disease and so on.
When facing these rose pests and diseases, we still need to spray pesticides in time for treatment and prevention. Today what Lanyao wants to talk about is a few precautions for spraying.
The above is a question asked by a gardening friend in Lanyao's reader group. From the picture, it can be seen that many young shoots have begun to turn black.
The leaves also show speckled scorched spots, and the leaf tips have turned yellow. These symptoms all appeared after spraying, so it can be seen that they were caused by the pesticide concentration being too high.
So how should you spray in order to avoid pesticide damage?
First, pay attention to the concentration of the pesticide.
Controlling the concentration is the key to avoiding pesticide damage. Generally, the packaging of pesticides has instructions for the mixing concentration, but most are calculated by mu.
Because agricultural chemicals were previously used for large-area crops, the unit of calculation is also by mu. For our home flowers, this calculation method is too large in scale.
If you are very good at arithmetic, of course you can convert and calculate it, but if you are like Lanyao and not great at math, then you can only estimate it yourself.
If you do not know how to calculate the concentration, how should you mix it?
If you, like Lanyao, do not know how to calculate the concentration, then the safe approach is to test it first. Generally, the concentration we use for fertilizing is above 2000 times, and you can also refer to this concentration when mixing pesticide.
First mix a concentration of about 2000 times and spray a single plant, then observe the effect. If it improves, you can continue spraying the pesticide solution at this concentration after a few days. If there is no sign of improvement, then you need to increase the concentration and try again.
Precautions when spraying pesticide:When spraying pesticide, first pay attention to personal safety protection. It is best to wear gloves, a mask, and long-sleeved clothes and long pants. When spraying pesticide outdoors, be careful to stand on the upwind side. Do not spray pesticide on windy days.
Not only should you pay attention to personal safety protection, but the amount of pesticide sprayed should also be controlled, and you should spray as evenly as possible. Both the front and back of the leaves should be sprayed.
When spraying, the speed of movement should be as even as possible, and avoid staying in the same position for too long, which can easily lead to excessive pesticide residue and fertilizer damage.
Usually, when the concentration ratio is moderate, spraying until the leaves are dripping wet is enough.
Lanyao suggests that when spraying pesticide, not only should the rose plant be sprayed, but the surface of the potting soil should also be sprayed, in order to kill bacteria and pests staying on the surface of the potting soil.
After reading Lanyao's introduction, do you have a new understanding of spraying pesticide? If you have questions, find Lanyao. You are welcome to follow myWeChat public account: Lanyao Garden (ilanyao)
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