Grey mould usually occurs in rainy season with high humidity, or it is caused by over watering.
In the early stage, the stems and leaves of the plants will produce water stained brown patches, and in the later stage, the patches will gradually spread, leading to the withered, yellow and rotten leaves and branches. When the humidity in the air is relatively high, grey mold will often appear in the affected parts.
In the process of star flower culture, the culture medium should always be kept in a semi dry state, do not over water, and put the plant in a ventilated place.
Frequently change the substrate in the flowerpot, and disinfect the new pot soil with chlorothalonil. After cultivation, continue to disinfect the plant, and use chlorothalonil every 10 days.
Once the disease of starflower plants is found, spray the whole plant with 1500 times solution of 50% promethazine or 2000 times solution of Ralstonia. If the disease is serious, pull out the plants in time and burn them.
Whitefly, adult 1-1.5 mm long. The wings and chest are covered with white powder. After laying eggs on the top of the plant, the eggs will enter the leaf tissue, maintain water balance with the plant, and are not easy to fall off.
After hatching, the nymph pricks into the leaf tissue with a mouthpiece and absorbs the nutrients from the plant. The leaves of the plant will fade and turn yellow, and eventually the whole plant will die.
In the early stage of cultivation, insect net can be used to block the invasion of external pests.
Before cultivation, the flowerpot and soil should be sterilized to prevent the emergence of pests.
If the adult of whitefly is found in the breeding of starflower, the yellow plate can be used to trap the adult and apply the glue to kill the adult, but the egg can not be killed. This method is easy to relapse.
Once it is found that the plants are harmed by whitefly, 2.5% Kungfu 2500-3000 times solution or 20% mieshali 2500 times solution are used to spray the whole plant, and the seriously damaged plants should be pulled out in time.
