Check the undersides of the leaves, and you might find the culprit: large groups of aphids and/or the sticky residue they leave behind after feeding. (Or, on plants with tightly-packed leaves like ...
You will not see the small, brown or greyish-purple aphids, but rather their woolly protective coating which is white and waxy. This coating looks rather like a fungus, especially when the woolly ...
However, the crop is occasionally attacked by insect pests. Like in your case, aphids, white flies and thrips are the common pests for this crop. White flies are tiny white flying insects that ...
The aptly named woolly aphids are fluffy white little things, and often look like blobs on your trees. They typically gather on older trees or those that have suffered stress from lack of food ...