I got an email from one of my readers this past week, and to quote her, “I have a couple of zucchini plants.
I noticed a couple of wilted leaves on the first plant one day, but the plant had naturally received the rain the last few days, so I don’t think it was under-watered.”
As a gardener, I can attest that squash plants can be easy to grow. As you look at your zucchini, it may not just be that your zucchini’s leaves are a problem.
Among the issues may be a deformed fruit, flowers not forming, or the crop dying.
One of the reasons for your squash vine to fail is that there is a Squash Vine Borer that bores through the vine. This insect eats the plant from the inside and causes the vines to wilt from the inside.
If you have a substantial infestation of this moth, it can have an enormous impact on the growth, health, and development of your zucchini plants.
To identify the adult Squash Vine Borer, you will see a black and red body with dark wings.
These moths fly fast. You will have to look fast to spot one of these tiny moths. The larvae feed on the main stem of the squash stem until they hollow out the center of the squash plant.
To identify this insect, you will see what looks like sawdust at the bottom of the stem. This crumbly waste is the leftovers from this insect feeding on the squash vine.
As a proactive solution to this insect feeding on your squash, wrap aluminum foil around the bottom of the plant’s stem.
Over the years, I have seen exclusion clothes like mini-fabric greenhouses installed over the row, covering all the plants under this row cover.
This shield will protect your zucchini long enough until it comes into full bloom. Squash Vine Borer lays her eggs before the squash comes into full bloom. After the plant blooms the moth won’t be able to lay her eggs.
Powdery mildew is a fungus that attacks your crop and covers the squash plant with a white powdery coating. Most of the time, this disease looks like it will be primarily an aesthetic concern, but it can get worse over time.
This fungus can coat your plant and prevent photosynthesis from taking place.
Eventually, this disease, if untreated, will cause your squash to weaken and die. Dead plants can be very wilted.
One of the mechanical solutions to this Powdery Mildew is to increase the space between the plants and encourage good air circulation.
I have seen squash grown on arbors to prevent this disease from becoming a problem. There are powdery mildew-resistant varieties of many squash species.
This next solution points to an effort I recommended a few months ago. If you recorded the squash varieties that you planted at the beginning of the spring and how well it’s doing, you can make a note not to get that variety next year, if it fails.
All zucchini plant varieties have different characteristics; they offer different yields, while others are more and less resistant to various challenges. It makes sense to know which zucchini varieties you should plant to eliminate growth and developmental problems.
As we have seen, climate conditions can be a concern, the kind of soil, and the amount of nutrients in the soil. For the most part, zucchini plants do not need highly nutrient-rich soil. The vigor of the plant to grow those long vines requires organic matter and a reasonable pH level of 6.5.
If the pH is too low or too high, it will cause the vine to wilt, or cause the green leaves to sprout faster, and the fruit will not appear on the vines.
Last year, I wrote about another insect called the Squash Bug. This insect also causes zucchini to wilt and have yellow and brown leaves.
This bug sucks the juices out of the plant using its sharp, pointed snout called the proboscis. They populate the area in clusters that cause damage to your zucchini plants.
Returning to the name of the column, strolling through your garden will allow you to inspect the crop, and you could see the Squash Bug’s tiny football-shaped bronze-colored eggs.
This pest is resistant to most insecticides. Horticultural oil is most effective against this pest in controlling its spread.
Squash of many varieties have been grown with great success in our area. I hope the information I have shared with you today will help you eradicate your wilty squash problem.
I hope you have a great stroll through your garden. If you see a problem, let me know by dropping me an email at ericlarson546@yahoo.com.