Helminthosporium Leaf Spot — Bipolaris spp.

Spotlight Name Archive: Leaf Spots

Spotlight Header Archive: Disease Diagnostics Photo Library

Host:palms, ficus, assorted foliage
Symptoms: This disease causes reddish-brown to black spots, approximately 2- to 5-mm long, all over the leaf surface. Yellow margins typically appear around the spots on palms. These spots coalesce under optimum conditions, forming irregularly shaped necrotic areas on leaf tips and along the margins.
Conditions Favoring Disease: This disease is favored by overhead irrigation and exposure to rainfall. Plants exposed to full sun are more severely affected by this disease than those produced with partial shade.
How Pathogen Survives/Disperses: Healthy plants can be easily infected by placing diseased plants in the same greenhouse or area. Splashing water, commonly produced by overhead irrigation, can easily dislodge large numbers of conidia and disperse them onto healthy tissue. Conidia can also be distributed by wind-driven rain.
Photo and write up provided by Syngenta Professional Products

from Syngenta Horticultural Services

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
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.
Stockslager 1
Davino 4 IMG_0552
Burress Leanna

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

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