Guava anthracnose: causes, symptoms, prevention, control

Guava anthracnose is a fungal disease that threatens guava production and negatively affects the quality of the crop. And in this article on your site botanist WORLD of PLANTS, we will review how to identify this disease, methods of prevention and treatment to ensure the health and productivity of the guava tree.

Symptoms of guava anthracnose disease

• English name: Guava Anthracnose
• Scientific name: Colletotrichum glyosporioides gloeosporioides Colletotrichum
• Type of diseaseFungal disease :
• Family: الكبيبات Glomerellaceae

Anthracnose can affect the leaves, stems and fruits of guava plants. On the leaves, they appear as irregular brown or black spots that may gather and cause leaf blight or leaf shedding. On the stems, the fungus can cause bedsores, death and leg girdling. On the fruits, the disease initially manifests itself in the form of small dark sunken spots that gradually swell and pink spore masses develop in the center. Infected fruits may wither, mummify and fall off prematurely.

Causes of guava anthracnose disease

Guava anthracnose is produced by the fungus gloeosporioides Colletotrichum, which can survive on plant debris and infect a wide range of hosts.

Conditions for the spread of guava anthracnose disease

Anthracnose prefers warm and humid conditions with temperatures between 68 degrees Fahrenheit and 86 degrees Fahrenheit 20( Celsius and 30 degrees Celsius) and frequent rainfall or top irrigation. The fungus produces spores (conidia) that can be spread by wind, rain, or water spray.

Guava anthracnose disease course

Anthracnose mushrooms can overwinter as dormant fungi or appressoria (,) acervuli survival structures on the remains of infected plants or on the bark of guava trees. In spring, when temperatures and humidity levels are favorable, the fungus produces spores that can start a new infection on leaves, stems or fruits. The disease cycle continues throughout the growing season as long as the right conditions persist.

Losses of guava anthracnose disease

Severe anthracnose infection can lead to significant leaf shedding, fruit rot and low yields. The disease can also weaken plants, making them more vulnerable to other pathogens and environmental stresses.

Guava anthracnose Disease Control Strategy

An integrated approach involving cultural practices, pruning and fungicide applications is recommended for the management of guava anthracnose.

Preventive measures for guava anthracnose disease

Remove and destroy the remains of infected plants, prune and discard diseased branches, ensure good air circulation in the orchard.

Organic / chemical control of guava anthracnose disease

For organic control, it can be copper-based fungicides (such as copper hydroxide and copper sulfate) or biological control agents such as spp .Trichoderma is effective when applied prophylactically. Chemical fungicides containing active ingredients such as azoxystrobin, peraclostrobin or difenoconazole can also be used according to the label instructions.

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References

Anthracnose – vnrnursery
Anthracnose of guava – eppo
Guava Wilt Disease (Nalanthamala psidii) – invasive