There are more than 30 known grape diseases. Among them, sour rot, anthrax and powdery mildew are the most common diseases. If we know more about grape diseases, we can improve grape growing environment, promote grape yield and improve economic benefits. More info:https://www.doraagri.com/common-grapevine-diseases/

1. Common grape diseases
There are more than 30 known grape diseases. Among them, sour rot, anthrax
and powdery mildew are the most common diseases. If we know more about
grape diseases, we can improve grape growing environment, promote grape
yield and improve economic benefits.
Sour rot
Sour rot is usually caused by the
mixture of acetic acid bacteria, yeasts,
fungi, Drosophila larvae and other
microorganisms. It is a serious disease
that can reduce grape yield by 30%-80%.
Symptom There are rotten grapes, if it is bagged grapes, under the
bags there is a dark moist, while there are vinegar flies around the rotten

2. ears, emitting acetic acid taste. White maggots can be seen in the rotten
fruit. As the rotten juice flows out, the place where the juice flows will rot.
Site of occurrence：fruit
Occurrence stage：After grape sealing→When grapes are colored
Best prevention time：Staining to Maturity
Control method
1、Selection of Disease-resistant Cultivars in areas with severe disease
and avoidance of planting cultivars at different maturity stages in the
same orchard.
2、It can be applied with bacterial agents (Chunlaimycin,Chitosan)
without toxicity and side effects, and the effect is remarkable.
3、Vineyards should be checked regularly to find out that the disease
grains should be removed in time and buried deeply; the permeability of
the orchard should be increased and the planting density should be
reasonable; the grapes should not be irrigated at the ripening stage.
Powdery mildew
It is a common disease of many plant species and belongs to the fungal
disease of the genus Leptospira of ascomycetes. Mycelium overwinters
in the injured tissue or between buds and scales. In the second year,
when the conditions are suitable, spores are produced and transmitted
by wind and insects, which infect young tissues such as leaves, fruits and

3. vines. In severe cases, white powders are covered with leaves, branches
and fruits, resulting in leaf curling, withering, small and sour fruits.
Anthrax

4. Anthrax is a fungal disease of the genus Anthracnose. The pathogen
overwinters by mycelium in the surface tissues of annual branches and
diseased fruits or in leaf scars, panicle stalks and joints. It usually occurs
in colored or nearly ripe fruits. In the grape field, anthrax is known as
bird's eye rot disease. It is a fungal disease. Fruit grains are soft rotten
and easy to fall off. In hot and rainy years, it is easy to spread in vineyards.
Grapes infected with anthrax are ugly and have low commercial value.
Symptom Brown lesions on leaves and stems may be the first
symptom of grapevine anthracnose, a disease similar to hail damage that
produces necrotic, irregular spots with dark
halos. The infected part cracks, causing the
grapevine to become brittle. Over time,
these spots accumulate into larger
depressions and may have reddish-brown

5. raised margins. These ridges distinguish fungi from hail damage and
may occur on either side of stems and leaves. In fruits, the center is light
gray, with thick dark edges around it.
Control method
1、In autumn, the diseased branches, ears and fruits on the shelf were
thoroughly removed, and the overwintering fungi were destroyed in
time.
2、Strengthen cultivation management, timely picking, strapping vines
and weeding, to create good ventilation and light transmission
conditions for plants, while paying attention to rational irrigation and
drainage, reduce orchard humidity, reduce the incidence of disease.
4、Bagging of fruit ears is a special measure to prevent grape
anthracnose. Bagging time should be early rather than late in order to
prevent latent infection of early young fruit. In particular, bagging of
high-quality fresh-eating grapes that are not resistant to disease is a
valuable measure to avoid anthrax infection and to make grapes free
from pesticide pollution.