Powdery Mildew: Causes, Symptoms, Treatment & Prevention Most fungal diseases want wet leaves. Powdery mildew is the odd one out. According to the University of California’s Statewide IPM Program, every powdery mildew species can germinate and infect without free water, and the disease is often favored by warm, dry days followed by cool, damp nights….
What Does Powdery Mildew Look Like? Signs, Symptoms & Identification Run a fingertip across a leaf that looks dusted with flour. If the white comes away as a fine, dry powder, there is a good chance you are looking at powdery mildew. But a handful of other things leave pale marks on leaves too, and…
Best Fungicides for Powdery Mildew: Organic & Conventional Options Most advice on the best fungicide for powdery mildew reads like a shopping list. The more useful question is about timing: has the mildew shown up yet, and how much of it is there? A product that protects clean leaves beautifully may do almost nothing for…
Powdery Mildew on Squash and Cucumbers: Treatment & Prevention White, dusty patches on squash or cucumber leaves, often on plants that have started setting fruit, are almost always powdery mildew. Remove the worst leaves, let in more light and air, water the soil instead of the foliage, and match any spray to the stage: sulfur…
Baking Soda Spray for Powdery Mildew: Does It Work? Search for a home remedy for powdery mildew and baking soda shows up almost every time, usually with a recipe and a confident promise. What the recipes rarely mention is how the remedy performed when plant scientists actually tested it. That record is more mixed, and…
Neem Oil for Powdery Mildew: Does It Work? How to Use It Most people reach for neem oil on a Saturday afternoon, right after the first white patches show up on a squash leaf or a rose. A week later, one of two things has happened. Either the patches stopped spreading, or they came back…
Powdery Mildew on Roses: Treatment, Fungicides & Prevention A dusty white film on young rose leaves is usually the first thing people notice. Soft new shoots and flower buds are where it tends to start, and the leaves underneath may already look slightly twisted by the time the coating shows up. This guide helps you…
Misshapen Cucumbers: Why They Curl, Bulge or Grow Unevenly Quick answer: Misshapen cucumbers are most often the result of incomplete pollination or uneven watering, with heat, cold and plain physical obstruction as secondary causes. Crooked or nubbed fruit usually means some of the ovules inside the flower were never fertilized. Fruit that is fat at…
Whiteflies Returning Despite Repeated Treatment Quick answer: Whiteflies usually return because treatment reaches only part of the population, not because every product has failed. All life stages overlap on the undersides of leaves, soaps and oils kill only what they touch, new adults fly in from nearby plants, and harsh sprays can wipe out the…
Zucchini Flowers Appearing Normally but Young Fruits Rotting at the Blossom End Quick answer: Baby zucchini that rot from the tip while the flowers look normal often point to one of three causes: poor pollination, blossom end rot, or Choanephora wet rot. Look at the rotted end. A yellow, shriveled tip is more typical of…
Cucumber Fruits Becoming Bitter Despite Healthy Growth Quick answer: A lush cucumber vine can still make bitter fruit, because bitterness is a stress response and not a sign of a sick plant. The bitter compounds, called cucurbitacins, normally stay in the leaves, stems and roots but can spread into the fruit under stress. Check watering…
Tomato Hornworms: How to Identify, Control and Prevent Them Quick answer: Tomato hornworms are large green caterpillars that can strip a tomato plant of its foliage. Handpick them when that is practical, leave any hornworm carrying white parasitic wasp cocoons alone, and use Bt on young caterpillars if you need more help. A tomato plant…
