Pests & Diseases

Black Spot

Black spot (Diplocarpon rosae) is the most serious and widespread disease of roses, thriving wherever there is adequate humidity and rainfall.

Iris Borer

Adult iris borer moths fly at night and mate during August and September.

Squash Vine Borer

Squash vine borers (Melittia cucurbitae) are a serious vegetable garden pest east of the Rocky Mountains.

Field Bindweed

Field bindweed (Convolvulus arvensis), also known as wild morning glory, creeping Jenny, corn bind, and devil’s guts, is one of the world’s worst weeds and among the most difficult to eradicate.

Apple Scab

Apple scab (Venturia inaequalis) is a problem wherever apples are grown; it’s more serious, however, in temperate areas that experience cool, wet weather in spring and early summer.