Inspect greenhouse transplants for pests
before you plant them into the field. Use the information below
to help identify problems. The most serious problems occur with
late blight, gray mold, silverleaf whitefly and pinworms—plants
found with these pests should be removed and destroyed.
- Bacterial speck.
Look for black lesions on petioles and stems.
spot. Look for water soaked areas on leaves.
- Late blight.
Look for rings of mycelium and spore-forming structures on
lower side of leaves.
- Botrytis (gray mold).
Look for gray-brown furry mold covering stems or leaves. Infections
that girdle the stem cause wilting above the infected area.
Plants with severe infections such as active lesions or dead
leaves or petioles should be destroyed.
- Pinworms. Look for leaf
If you see whiteflies, distinguish
silverleaf from greenhouse whitefly. Plants with silverleaf
whitefly may need to be destroyed, while greenhouse whitefly
is typically of little concern.