Diseases of Grapevine in Missouri
by Laszlo Kovacs
Eutypa Dieback
Pathogen:
Eutypa armeniacae Hansf. & Carter
Impact on grapevine: Slowly kills internal tissues in perennial wood,
causing partial or complete dieback of cordon arms or entire vines.
Symptoms: Young shoots are stunted with short internodes and small, cupped
and occasionally tattered leaves. The leaf symptoms are best visible in May and
early June when normal healthy shoots are less than 10 inches long.
Susceptible growth stages: Infection occurs during the winter and spring
when fresh pruning wounds provide access to the internal tissues for germinating
spores.
Favorable conditions: Warm periods during dormant pruning, especially when
plants are in deep dormancy and wound healing is slow.
Preventive and emergency fungicides: In Missouri, no fungicide is labeled
for the protection of pruning wounds.
Cultural practices: Sanitation is essential. Dead grape wood should be
removed from the vineyard and destroyed. In regions where eutypa dieback is a
serious problem, the use of a double trunk system is recommended.
Susceptible cultivars: All grape varieties are susceptible to eutypa.
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Wood decay caused by
Eutypa. |
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Cankers on
trunk.
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Although
eutypa dieback is present in Missouri, the disease is not considered
economically important. As more and more vineyards are coming of age, however,
it is important to scout for the symptoms in the spring.
Go back to the Diseases
of Grapevine in Missouri. |
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