If it’s an insect, the plant may have holes in its leaves. Turn the leaves over and you may see the insects themselves clustered on the underside of the leaves. You may also see and feel a sticky substance if it’s an insect because the insect will leave a secretion on the plant.

The best way to control anthracnose includes several measures. Starting with varieties that are resistant to disease, especially anthracnose, be sure to prune the tree during the dormant season by removing dead branches. Apply fungicides in the springtime just at bud break. You will probably need to do this once every week or two until the leaves have fully stretched out. You may need to apply the fungicide during the summer if there is a lot of rain.

It’s most likely the honeydew from “sucking” insects. These insects have mouthparts that allow them to penetrate the plant tissue and suck the juices of the plant. They then secrete the honeydew which is the sticky substance found on plant leaves. Such insects include aphids, thrips, squash bugs, and mites.

One of the best ways to prevent insect problems in your soil is to till the soil. When you till it, insect grubs and larvae will be brought to the surface where they likely will end up dying

Yes, they will be even better for the environment and for your insect control needs. Organic control methods target the specific insect pest, usually without harming the beneficial insects you want in your garden to help with insect pest control.