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 […]

Halo Blight (Beans)

Halo Blight (Beans) Description: Symptoms of halo blight start as small watersoaked spots on leaves, which gradually turn dark brown. The spots remain small and become surrounded by a wide yellow-green halo. The spread and development of halo blight is favored by wet weather and plant injury from rain, hail, people or equipment. Halo blight develops best when temperatures are […]

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

Angular Leaf Spot (Cucurbits)

Angular Leaf Spot (Cucurbits) Description: Angular to irregular water-soaked spots form in the leaves. When moist, droplets of bacteria ooze from the underside of lesions and dry to a white residue. The lesions later turn gray to brown, dry, and tear away, leaving large irregular holes. The bacterium overwinters in diseased plant refuse and on the seed coat. Disease is […]