0
points
to differentiate between anthragnose and angular leaf sport disease of the beans

Symptoms    Amagoro,Kenya

there was also premature leaf fall besides the scotches on the leaves


Posted by: kelvin nyongesa (1 point) kelvin nyongesa
Posted: October 17, 2019


kelvin nyongesa commented,
Is there any site that has the best videos and notes a bout the diseases of maize, tabbacco and groundnuts especially, Tomatoes and any other usefull agricatural practices
It will be very helpfull to advice farmers on what to do
I like videos since I learn fast through that
I spent my leisure time watching and reading as well

30 days ago.



Answers

2
points
Anthracnose (Colletotrichum lindemuthianum)

Symptoms of anthracnose can appear on any plant part. Pale brown sunken spots may appear on the cotyledons of infected seedlings. Water may spread the disease to the hypocotyl, which if girdled, kills the seedling. Lesions on leaves are dark brown. They are restricted to the veins on lower leaf surface. On stems, lesions are elongated and sunken. On the pods, the fungus produces black, sunken lesions. These lesions penetrate deep into the pods and may cause shrivelling of the young pods. Infected seed become discoloured changing to yellow through brown to black.

In damp weather, the centres of anthracnose lesions become covered with a pink spore mass. The disease is seed-borne.


Angular leaf spot (Phaeoisariopsis griseola)

Symptoms consist of small dark brown spots with angular edges and are often numerous to give the foliage a checker-board appearance. The spots may increase in size, join together, and cause yellowing and necrosis of the affected leaves. This may lead to premature defoliation. When humid, the fungus produces a grey mould on the lower surface of the spots. Infected pods have brown blotches. The disease is favoured by high moisture and moderate temperatures (20-25degC).

The disease is seed-borne.



Posted by: David Hughes (43 points) David Hughes
Posted: October 18, 2019


kelvin nyongesa commented,
Thank it was a wise answer. At least I can tell the difference between the two diseases
30 days ago.



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