Environmental stress
Nitrogen deficiency
Nitrogen deficiency is a nutritional disorder that reduces chlorophyll production, growth and yield. The earliest visible sign is usually uniform pale-green to yellow foliage,…
DetailsPLANT DOCTOR
Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Disease
Phytophthora cryptogea Root and Crown Rot
Phytophthora cryptogea Pethybr. & LaffertyPhytophthora cryptogea is a soil- and water-associated oomycete that causes root rot, crown rot, stem lesions, blight, wilting, and plant collapse in susceptible crops…
Details
Disease
Phytophthora root and crown rot
Phytophthora nicotianaePhytophthora nicotianae is a soilborne water mold with a broad but host- and isolate-dependent host range. It commonly causes root, crown, stem, tuber, fruit,…
Details
Disease
Sudden oak death and ramorum blight
Phytophthora ramorumPhytophthora ramorum is an invasive, fungus-like water mold that causes sudden oak death in susceptible oaks and tanoak, and ramorum blight or dieback on…
Details
Disease
Red Stele of Strawberry
Phytophthora fragariaeRed stele is a persistent, soilborne root disease of strawberries caused by the oomycete Phytophthora fragariae. It is favored by cool, saturated soil and…
Details
Disease
Phytophthora cactorum crown, collar, root and fruit rot
Phytophthora cactorumPhytophthora cactorum is a soilborne oomycete that causes crown, collar, root, stem, fruit and occasional foliar diseases on a wide range of woody and…
Details
Disease
Phytophthora Root Rot
Phytophthora cinnamomi RandsPhytophthora cinnamomi is a soil- and water-borne oomycete that causes destructive root, crown, collar, and basal stem rots in many woody plants, ornamentals, fruit…
Details
Disease
Phytophthora blight
Phytophthora capsiciPhytophthora capsici causes a destructive, water-driven disease of cucurbits, peppers, eggplant, tomatoes, beans and other crops. It can attack roots, crowns, stems, leaves and…
Details
Disease
Late blight
Phytophthora infestansLate blight is a fast-moving, potentially devastating disease of tomatoes and potatoes caused by the water mold Phytophthora infestans. It produces water-soaked to dark…
Details