0
points
Black / Grey spots on bottom side of he leaves Photos attached.

Okra    Kerala, India

I have few okra plants. Yield is also regular and the plants are three months old. Recently I saw Black / Grey spots on the bottom side of the leaves. Mainly this is seen in the lower leaves of some plants and for one plant which is small, the spots are seen on all the leaves. Photographs attached for clarity. Can anyone help in understanding the problem and suggest remedy for the same. Thanks in advance.


Posted by: Renjith (3 points) Renjith
Posted: July 29, 2015




Answers

1
point
It is sooty mold. Although sooty molds don’t infect plants, they can indirectly damage the plant by coating the leaves which inhibits sunlight penetration. Without adequate sunlight, the plant’s ability to carry on photosynthesis is reduced, which can stunt plant growth. Coated leaves also might prematurely age (senesce) and die, causing premature leaf drop.

You can spary starch to control sooty mold.

ಇದು ಕಂದುಬಣ್ಣದ ಅಚ್ಚು ಆಗಿದೆ . ಕಂದುಬಣ್ಣದ ಜೀವಿಗಳು ಸಸ್ಯಗಳು ಸೋಂಕು ಇಲ್ಲ ಆದರೂ, ಅವರು ಪರೋಕ್ಷವಾಗಿ ಸೂರ್ಯನ ನುಗ್ಗುವ ಪ್ರತಿಬಂಧಿಸುತ್ತದೆ ಇದು ಎಲೆಗಳು ಮುಚ್ಚುವ ಮೂಲಕ ಸಸ್ಯ ಹಾನಿಗೊಳಗಾಗಬಹುದು. ಸಾಕಷ್ಟು ಸೂರ್ಯನ ಇಲ್ಲದೆ, ದ್ಯುತಿಸಂಶ್ಲೇಷಣೆ ಕೈಗೊಳ್ಳಲು ಸಸ್ಯದ ಸಾಮರ್ಥ್ಯ ಸಸ್ಯ ಬೆಳವಣಿಗೆ ಸಾಹಸ ಇದು ಕಡಿಮೆಯಾಗುತ್ತದೆ. ಕೋಟೆಡ್ ಎಲೆಗಳು ಸಹ ಸಮಯಕ್ಕೆ ವಯಸ್ಸು ಅಕಾಲಿಕ ಎಲೆ ಡ್ರಾಪ್ ಕಾರಣವಾಗುತ್ತದೆ ( ಮುಪ್ಪಾಗು ) ಮತ್ತು ಸಾಯಬಹುದು .

ನೀವು ಕಂದುಬಣ್ಣದ ಅಚ್ಚು ನಿಯಂತ್ರಿಸಲು starch spary ಮಾಡಬಹುದು .


Posted by: Dr. Ravishankar Narayana (8 points) Dr. Ravishankar Narayana
Posted: September 11, 2015




0
points
It looks like sooty mold. This is a fungal growth that is promoted by the presence of Aphids (insects) that feed on the underside of the leaf. They excrete sugar.

Can you see any small green insects (aphids)?


Posted by: David Hughes (43 points) David Hughes
Posted: July 29, 2015


Renjith commented,
Thanks for the reply David. You are right, there is mild aphid infestation. I have sprayed tobacco decoction and neem based solutions to control the aphids. So I think now a copper based fungicide like Bordeaux Mixture will help curing the problem. Am I right??


over 4 years ago.

David Hughes commented,
yes, they will help it if it is fungus. Perhaps try it will just a select few leaves and monitor progress
over 4 years ago.

David Hughes commented,
yes, they will help it if it is fungus. Perhaps try it will just a select few leaves and monitor progress
over 4 years ago.



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