What is it like when guava has scab? what kind of medicine does guava have scab?

Do you know what the disease of guava scab is and how to treat it? Let's take a look.

Symptoms: when the initial infection, the spot is round, slightly raised, the surface of the spot is rough and cracked, such as scab-like, brown, the edge is light brown or soil yellow color, the size is about 2mm, there is a black ring dot in the center of the spot, black powder or curved column will be released from the top of the black spot, the stalk shell and spores of the pathogen will be released, and the tissue epidermis of the edge and healthy parts of the spot will separate when the spot is sunken, and the spot will not fall off.

Flesh tissue will appear two kinds of symptoms, one is flesh softening, water immersion, pulp color turns orange or purple; the other is flesh cork yellow brown, will not soften or water immersion, often accompanied by fruit calcium deficiency phenomenon, calcium deficiency, browning will appear in the skin near the center and outside of the fruit, gradually forming a transverse zone or a ring spot, so the fruit weakens and ages earlier.

The Thai strain has a strong growth potential, and the fruit trees have no infancy, so the branches that grow upward will blossom and bear fruit. The fruit growing on the branches will often appear rump rot (blossom end rot). The symptoms are cross-band browning or browning at the bottom of the fruit, which is closely related to the occurrence and infection of a variety of weak pathogens.

Prevention and control methods:

First, timely pruning to make the orchard well ventilated, avoid planting too dense fruit trees; do not mix other fruit trees, reduce the number of intermediate hosts, can help the prevention and treatment of scab.

Second, clean up the diseased fruit in the field and burn the diseased leaves or branches to remove the pathogen.

Third, avoid repeated use of old packaging bagging, small fruit bagging protection has a good prevention and control effect, but some fruit farmers because of thrifty habits, often repeated use of bagging, easy to catch scab.

The symptoms and methods of prevention and treatment have been accepted, and now you know what to do.