chaseagri

Phytophthora Root and Stem Rot — Phytophtora cryptogea, P. nicotianae, P. drechsleri

Spotlight Name Archive: Rots

Spotlight Header Archive: Disease Diagnostics Photo Library

Host: Broad range of annuals and perennials, including African violet, azelea, geranium, lisianthus, petunia, poinsettia, pothos, vinca, spathiphyllum and dianthus

Symptoms: Often, the first symptoms are lower leaf yellowing, wilting and stunting that mimics nutrient deficiency. Infected roots appear gray, brown or black instead of white, starting at the root tip and spreading throughout the root system, often causing a base stem canker.

Conditions Favoring Disease: The most common causes of this disease are excess water, either from over watering or poor drainage, and cool soil temperatures. Plants whose roots have been injured by over fertilization or pests are especially susceptible to infection.

How Pathogen Survives/Disperses: Generally soil born organisms, some Phytophthoras form swimming spore stages that are favored by subirrigation systems where the spores are easily transferred between plants.

Photo provided courtesy of Chase Research Gardens, write up by GPN Staff.

from Chase Horticultural Research Inc.




Latest Photos see all »

Lupine Staircase series (Green Fuse Botanicals)
IMG_0518 copy
IMG_0469 copy
IMG_1488 copy
IMG_1587 copy
IMG_1517 copy
40under40
GPN recognizes 40 industry professionals under the age of 40 who are helping to determine the future of the horticulture industry. These individuals are today’s movers and shakers who are already setting the pace for tomorrow.
IMG_7650_0
40u40-jpwilliams
Boldt Jess 1 IMG_1314
Ernest 2
Morrow1
IMAG1099
Burress Leanna
Alldredge 2 Skydiving
krugbrian

75 Applewood Drive, Suite A
P.O. Box 128
Sparta, MI 49345

616.887.9008
GPNJuly_Cover
Interested in reading the print edition of Greenhouse Product News? Preview our digital edition »

Get one year of Greenhouse Product News in both print and digital editions for free.

Subscribe Today »


Be sure to check
out our sister site.
website development by deyo designs