Fusarium Root and Crown Rot (Tomatoes)

Fusarium Root and Crown Rot (Tomatoes) Description: Entire root system is affected. Brown discoloration is obvious at the base of the stem. Disease progresses slowly from bottom to top, sometimes causing wilting. Disease is widespread in tomato growing regions. Solution: Maintain soil pH at 6.5 to 7.0. Test soil pH; if it is too acid, use ground limestone to raise […]

Fusarium Basal Rot (Onions)

Fusarium Basal Rot (Onions) Description: First seen as curving, yellowing of leaf tips, progessively moving downward. Solution: Do not grow grain cover crops in rotation with onions or garlic. Maintain soil pH at 6.5 to 7.0. Test soil pH; if it is too acid, use ground limestone to raise pH. Most garden centers and farm stores sell ground limestone. Do […]

Flea Beetle

Flea Beetle Description: Black, often with a curved yellow or white stripe on either side of its back. Flea beetles are seldom actually seen; they hop away before you get close enough to see them. They eat nearly all garden crops, and the adults are very troublesome when seedlings are set out. Leaves become riddled with little holes, chewed through […]

Fire Blight (Apples & Pears)

Fire Blight (Apples & Pears) Description: : Can cause severe damage to apple and pear trees. Fire blight usually attacks blossoms, but infection and dieback of new shoots is common (see photo). The downward curled twig tip is characteristic of fire blight. Solution: Cut off infected twigs and branches 12″ below the dead area. Disinfect pruning tool between cuts by […]

European Corn Borer

European Corn Borer Description: White to flesh-colored larvae with brown spots and dark head, up to 1″ long, overwinter in corn stubble. They like all types of corn, especially sweet corn. First signs are “shotgun” holes in the whorl (the funnel-like new growth). Shortly after, borers move into the stalk or ears and frequently leave “sawdust” around borer holes. Broken […]

Early Blight (Potatoes & Tomatoes)

Early Blight (Potatoes & Tomatoes) Description: Problem for potatoes and tomatoes. Irregular brown spots show on lower leaves first. Lower leaves fall off, tomatoes are exposed to sun, causing sunscald. On old plants, it sometimes causes black, sunken spots near the stem end of tomatoes. Solution: Begin applying Soap-Shield® Fungicidal Soap or Copper Dust soon after setting out plants, then […]

Anthracnose (Beans)

Anthracnose (Beans) Description: Fungi live on infected bean seed and in debris that has been left on top of garden soil. Moderate, frequent rainfalls, especially if accompanied by winds, provide perfect conditions for spread of anthracnose. Solution: Plant beans in a different location each year, and purchase disease-free seed each year. Anthracnose is spread quickly and easily when plants are […]

Downy Mildew on Roses

Downy Mildew on Roses Description: Downy mildew affects roses throughout the U.S. Infection begins on young plant growth. Leaves develop dark purplish to dark brown spots. Symptoms may resemble burns caused by pesticide toxicity. Humid, cool conditions favor downy mildew infection. Solution: If downy mildew has been a problem in the past, begin spraying Soap-Shield® Fungicidal Soap when new spring […]

Downy Mildew (Onions)

Downy Mildew (Onions) Description: Spots on the leaves become covered with a lavender or purplish mold. Requires cool temperatures and rain or high humidity. Under these conditions, onion leaves bend, resulting in lower yields and bulb quality. Solution: Grow onions in well-drained soil to keep roots from getting soggy. To prevent the spread of disease, wash tools and shoes after […]

Downy Mildew (Cucurbits)

Downy Mildew (Cucurbits) Description: A period of at least 6 hours at 100% humidity on the leaf surface is required for infection. Downy mildew symptoms vary considerably, plant to plant. Lesions appear first on the oldest leaves and then spread to the younger leaves. Solution: Use plant spacings which reduce canopy density, and avoid overhead watering to help reduce the […]