Sick Leaves

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Calcifer Mountain View, CA(Zone 9b) Jan 25, 2020

Guess what these black spots are on the basil leaves? Should I just toss the plant or remove the leaves and try to save it?

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Post #10466432
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natureguyfrog San Diego, CA Feb 10, 2020

If you can remove the most damaged leaves without totally destroying the plant. Maybe pinch the new shoots that look like they are severely damaged. Also give an all-purpose liquid fertilizer. Especially one that indicates that it can be used on the foliage as well. Do this perhaps a few days after using one of the following products which are totally organic and non toxic to bees etc.

1) [Serenade Garden AGRSER32 Disease Control Effective Organic Fungicide, 32-Ounce, OMRI Listed]

2) [Organic Laboratories 810-021 Lab QT Organocide Plant Doctor Systemic Fungicide]

The latter specifically states that it is effective when diseases are already present. The former is probably just as effective and more commonly available in nurseries.
Both of these and others to choose from are available from amazon.com. Just be sure that they are systemic using a form of bacteria and not chemicals! Also there are external (non-systemic) disease controls that will most likely not be effective in your case!

One last thing- diseases often are spread by insect pests. Look closely at the leaves for insect damage that may not be so obvious. Also perhaps sacrifice one of your plants and thoroughly explore the area around the roots and the over-all vitality of the roots.
This year the grubs of the May/June bugs have been extreme! I have never seen so many.
Often if plants have a damaged or "ill" root system they are proportionately susceptible to diseases!

Post #10468405
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Calcifer Mountain View, CA(Zone 9b) Feb 15, 2020

Thank you! These are definitely brought on by insect pests. There are often glistening residue on the leaves. The plant seems to rebound and looking better now.

Post #10468793
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kittriana Magnolia, TX(Zone 9a) Feb 18, 2020

Glistening residue- snails, slugs?

Post #10469065
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