1、 White mold

Symptoms: this disease mainly invades the leaves of the plant. At the beginning, there are patches of white spots. Later, the leaves will fall

Control method: once found, the damaged leaves should be removed immediately and sprayed with chlorothalonil 600-800 times the concentration of 75%

2、 Leaf spot

Symptoms: it also infringes on its leaves. If you don't use it as soon as possible, the plant will wither and die if the disease is serious

Control method: cut off the damaged leaves, burn them together, and then spray them with 1000 times of ammonium metasen solution with a concentration of 50%. In addition, the fallen leaves should be cleaned up in time

3、 White rust

Symptoms: it will invade the leaves, petioles and stems of the plant. At the beginning of the disease, there are small light green spots, then slowly turn into yellow spots, and finally form large white scars and protuberances

Prevention and control method: after discovery, it is necessary to prevent and control with Bordeaux solution of 1% concentration or Phytophthora net of 50% concentration, and insist on using it, once every 10-15 days. If you don't insist on spraying, the effect is not very good

4、 Aphid

Symptoms: This is the most common kind of insect. It will harm the leaves and tender stems of the plant, which is very harmful to the plant

Control method: isolate the endangered Petunia from other plants and spray with 10% Omethoate emulsion