There are brown spots on the green leaves of Pittosporum japonicum. These spots are round, oval and irregular in shape. Some are large and some are small. The color is dark brown and light brown. Some have one spot on one leaf and some have several spots of different sizes. This is called brown spot. Brown spot will produce small black spots in the center of the spot in the later stage, which is the pathogen.
First of all, isolate the pathogenic bacteria at the source, and the buyer shall pay attention to check the leaves when purchasing, instead of buying the seedlings with spots; the Seller shall check his own seedlings at any time, and treat or destroy them in time in case of any disease. After purchase, plant in a scientific way, take care of it carefully, and enhance the immunity of Haitong. If any spotted branches and leaves are found, they shall be removed and destroyed in time. Make sure they have this disease, but also according to the correct treatment method according to the amount of time spray pesticide treatment.
The bituminous coal disease mainly displays in the leaf, is some like the coal ash mold matter, will cover in the leaf surface, lets the leaf not receive the light, then causes it not to be able to grow normally, finally only can dry and die.
Because soot disease mainly affects the light of plants, so to prevent and control this disease, we must make the branches and leaves reasonable, sparse and orderly, so that each leaf can bathe in the sun; find the diseased branches, cut and destroy them in time.
The scale is a kind of insect that looks like a spider. It seriously affects the healthy growth of Pittosporum japonicum. It happens many times a year. It's very stubborn and hard to control.
As for the prevention and control of brown spot disease, the first step is to stop it from the source. The buyer should pay attention to the inspection when purchasing, and refuse to purchase if any insect is found. The seller should take good care of his seedlings, find any insect and treat it in time. After planting, we found pests. First of all, we need to cut off the branches and leaves with pests, take them out of the field and destroy them. We can also use insects to prevent insects, and introduce the Red Ladybug who likes to eat the sponge scale. Of course, we can also use drugs to prevent them.
