Downy Mildew | Powdery Mildew | Black Rot | Phomopsis | |
Latin Name | Plasmopara viticola | Erysiphe necator | Guignardia bidwellii | Phomopsis viticola |
Lifecycle | Downy Mildew Lifecycle | Powdery Mildew Lifecycle | Black Rot Lifecycle | Phomopsis and Leaf Spot Lifecycle |
Primary Infection | Oospores | Ascospores | Ascospores | Pycnidiospores |
Secondary Infection | Zoospores | Conidia | Pycnidia | Overwintering Form | Oospores in fallen leaves Mycelium in buds |
Hyphae inside dormant bud scales Cleistothecia on the surface of the vine |
Mummies in berries, vine or in the ground | Mycelium and pycnidia in bark Mycelium in dormant buds |
Favorable Conditions | Warm and wet conditions Infection generally occurs in the morning |
High humitiy, temperatures between 68 to 81 oF Low, diffuse light Shady portions of the vineyard |
Temperature and age of tissue when infected | Rainy weather during the early growing season | Method of Distribution | Rain splash Wind |
Wind dispersal; does not require rain or water | Rain water | Splashing rain water |
Susceptible Tissues | All green parts of the vine esp. leaves Plant structures with stomata are susceptible |
All green tissues of the grapevine | All new growth during the growing season All green tissues |
Shoots, leaves, rachis |
Control of the Disease | Sulfur: both preventive and curative, applied as both dust or as wettable powder | |||
Cultural Practices | Good soil drainage Reduce overwintering inoculum Prune infected shoots |
Reduce humidity Get good air circulation in the vineyard Provide good light exposure |
Canopy management practices to improve air circulation Remove all mummies during the dormant period |
Increase air circulation in the vineyard Remove diseased canes during normal pruning operations |
Link to Cornell IPM pdfs | Downy Mildew---Diease Identification Sheet No. 5 1984 | Powdery Mildew---Diease Identification Sheet No. 102GFSG-D2 2003 | Black Rot---Disease Identification Sheet No. 102GFSG-D4 2003 | Phomopsis---Disease Identification Sheet No. 6 Revision 1991 |
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Tuesday, April 1, 2014
Fungal Diseases of Grapevines: Overview
There are so many things to remember about fungal diseases of grapevines so I put it all together in a table so that I could compare the details side by side.
I'm still looking into how to control the diseases organically, so I'll be updating this form. All of the information came from the links to the Cornell IPM pdfs. This form is also located under the tab Fungal Diseases of Grapevines.
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