What Is a Melanotic Macule?

Black spot refers to the appearance of dark spots on the leaves of plants. Black spot is also called blackspot. Common diseases of Aconitum, Aster, Cactus, Delphinium, Elm, Red Lotus, Cherries, Solidago, Holly, Delphinium, Vernonia, Orchid, Primula, Rubus, Rose and Beet.

[hi bn bìng]

Black spot refers to the appearance of dark spots on the leaves of plants. Black spot is also called blackspot. Aconitum, Aster, Cactus, Delphinium, Elm,

The term black spot disease often refers to the black spot disease of rose caused by Diplocarpon rosae, and it is a serious disease that is widely distributed outside the arid regions. It is a round spot on the rose, one centimeter in diameter, with a edging. The leaves of infected plants turn yellow and fall off early. Infested plants can fall off twice during the growing season, are severely weakened, have few flowers and are poor, are susceptible to ulcers, and easily die from winter damage. Countless spores are formed in conidial trays, which are transmitted from splashing raindrops, dew, watering and gardeners working in wet plants. It takes about 9 to 18 hours or more for the spores to germinate and invade the rose tissue. New leaf spots appear within 3 to 16 days, and spores form within 10 to 18 days. This cycle repeats during the growing season.

Leaves, petioles, twigs, pedicels, and young fruits can all be harmed, but mainly the leaves. There are two types of symptoms: one is reddish-brown to purple-brown dots on the leaf surface at the beginning of the disease, which gradually expands into a round or irregular dark black lesion. There are often yellow halos around the lesion, and the edges are radial and disease The spot diameter is about 3-15 mm. In the later stage, small black spots are scattered on the disease spots, that is, the conidial plate of the pathogen. In severe cases, the lower leaves of the plant wither yellow and fall off early, causing individual branches to die, such as rose black spot. The other is a brown to dark brown nearly round or irregular wheel pattern with black mold on the leaf, which is disease

Conidia of bacteria. In severe cases, the leaves fall early, affecting growth, such as

Black spot disease is a major disease on rose and vegetable crops, and it is widespread and serious. Germs

Use excellent disease-resistant varieties.

Remove dead branches and leaves after autumn and burn them in time.

Black spot disease is caused by Pijuxin trematodes, and is also considered to be Pijuxin trematodes and other species.

Signs of black spot infection

Small black or brown spots, up to 2 mm wide, appear on the body and fins, and sometimes on the eyes and mouth.

Black spot infection details

Spots are the cysts of the larvae of intestinal trematodes, such as the trematode Pijuxin, which have heavy pigments. The larval stage is also known as the larval trematode. Adult worms live in the intestines of waterfowl, which are infested by eating fish that harbor larvae. In the internal organs of the waterfowl, the membrane surrounding each larva spreads out, and the worms mature after a few weeks. The eggs laid by the adult are excreted in the bird's excrement. The eggs that fall into the water develop into a free-moving larva. A few weeks later, the parasites left the water snails and began another cycle of sending suitable fish hosts. When the parasites reach a width of about 1 mm, a black film develops on each worm's body, forming unique spots under the skin. Minor black spot infections do little harm to fish, because life cycles and complex environmental conditions will not cause black spot infections to pass from one fish to another.

Recommended treatment for black spot

New anti-parasite treatments can kill parasites, but once dark spots form, they leave marks. The most effective precaution is to break the parasite's growth cycle by ensuring that waterbirds are not close to ponds or aquariums and that no snails parasitic from parasites are present.