Not sure which zone 9 you are growing in, but - here in mine, cucumbers aren't planted out until April. They may just be too cold yet.

I'm just now planting out my early crops - lettuce, cabbage, choys, garlic, onions, etc. (Oct, Nov, Dec).

The warm crops - tomatoes, peppers, melons, cukes, squash usually go in around Apr, May, June.

The yellow leaves could be due to that, but also a lack of iron, nutrition or other stress-related symptom.

Just my 2 c's. Giving a zoning by Sunset might help determine your growing temps, however.

I'm considered a zone 10 or 11, but in California it is also a zone 23-24, which is a bit more defining.

Bejay

I like it that you saw some stuff and sprayed it with gunk. Sweet.

Nonetheless, with the quality of that pic, looks like aphids. Other one can't tell but looks like inadequate N and maybe CMV, but hard to say with that one pic. You may be able to get a crop in C FL in winter.

Dan

Ok....the gunk is malathion. I still can't see any bugs, just black specs (like dirt) ath I assume are droppings.

For the yellow....all purpose miracle grow is 24-8-16 and has iron. I will give that a shot.

The black specks are small aphids. You could wash them off.

For the yellow, you likely need nitrogen.

You didn't ask about this but I'm going to say it anyway: its usually a good idea to hold off on the big guns (ie. malathion) until you are sure what pest you are dealing with. I usually start with trying to wash the pest off with water, or water with a bit of soap in it. It may take more than one treatment but will usually resolve the problem. If not, you can research what might work that is less toxic than malathion...which can kill your beneficial insects (like ladybugs that eat aphids) and pollinators. JMHO.

Malathion is toxic on several levels to humans. Use of this and other toxic pesticides can cause cancer and blood disorders. My FIL was always remarking when he saw bugs in my garden that I should spray. He did. He had Non-Hodgkins Lymphoma and Leukemia, and prostate cancer, at the end of his life and suffered a lot. Worth it?

My answer to bugs is to grow a wide diversity of flowering plants to befriend and feed the beneficial insects, which will then help you to keep down the bad insects.

Here is a link that might be useful: Malathion

Hemnancy, is Sevin (Carbaryl) as toxic as Malathion? Sevin is all I use.