![]() One current problem I have recently discovered is that some manufacturers of bagged organic soil amendment are using wood products that have not had adequate nitrogen added to them in order to make them rot. Yellow leaves on vegetables usually mean they do not have enough nitrogen. They are more like a terrace, large enough that they can be treated just as if you were planting in the ground. The problems you are having come from using potting soil in your raised beds instead of filling them with good quality amended top soil. I have to add extra water from the hose or there are dry spots. If anything, it’s too good! Also the plants seem to need more water than the drip system provides. What causes the yellow leaves and how can I correct the problem? The drainage is excellent. I have fertilized regularly with organic fertilizer according to package directions and I use a drip system for watering. However, rest assured that pumpkins are not overly-tricky crops to grow, and try not to let any of the issues mentioned put you off growing pumpkins as part of your backyard ideas.I am growing vegetables in raised beds filled with a very good potting soil. Correct planting, watering, and maintenance all play their part, together with knowing how to prune pumpkins and when to pick pumpkins off the vine. If you are growing pumpkins, then keeping them healthy is vital to get great fruits. Remove yellow leaves with sharp and clean pruning shears and do not use any diseased leaves to make compost. In addition, the leaves are pulling energy away from healthier parts of the plant. ![]() ![]() The leaves are potential attractors for other pests and fungal diseases, so removing them can help preserve the health of the plant. It is recommended to remove yellow or damaged leaves on pumpkin plants. FAQs Should you trim yellow leaves on pumpkins? Sue Bradley writes about gardening, food and wildlife, and the fascinating people who are passionate about these subjects, for a variety of magazines. There is no cure for wilt and plants need to be lifted and destroyed, but you can get fungicidal treatments to deal with many other issues, such as Bonide Captain Jack's Copper Fungicide available at Amazon. Other potential diseases that cause pumpkin leaves to turn yellow are bacterial leaf spots, alternaria blight, and bacterial wilt. If mildew does hit, she suggests: ‘At the first sign, cut off affected leaves and spray with foliar feed to help the plant to fight back and reduce the possibility of spores being spread by rain.’ Sue Bradley, a gardening expert, warns of powdery mildew, a fungal disease that can cause leaves to become yellow as well as covered in a white coating. Squash bugs can be knocked off the plant with a jet of water, which is also a good way to get rid of aphids that can suck sap from leaves and cause them to discolor. Vine borers tunnel into the stems themselves and you may have to slit open the stems or remove sections of the plant to get rid of squash vine borers. Pests including squash vine borer and squash bugs can suck sap from pumpkin plants and cause yellow leaves and wilting plants. If there seems to be a lack of nutrients causing the leaves to turn yellow, it is best to add a balanced fertilizer that is specially formulated for growing vegetables, such as Espoma Organic Garden-tone Vegetable Food, available at Walmart. If not beforehand, mulching around plants can do the same. Start adding nutrients into the soil even before the time comes when to plant pumpkins, as adding compost or well-rotted manure can help boost soil fertility and its water-retention levels. If the entire leaf is yellow it indicates a lack of nitrogen, while yellow on just the margins or central vein is more a sign of a lack of potassium, magnesium, or iron. Which part of the leaf is yellow could indicate what nutrient the pumpkin needs. Pumpkins are hungry crops and need a lot of nutrients and water to grow, they need lots of nitrogen to put on a mass of foliage and then phosphorus and potassium to grow and ripen fruits. (Image credit: Getty/Maxim Chuvashov) NutrientsĪ deficiency of nutrients in the soil could be the reason for pumpkin leaves turning yellow.
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