Fruit Spray Schedules for the Homeowner

Grapes

Grapes
Dormant spray

Apply before buds swell.

Anthracnose, powdery mildew, phomopsis, cane and leaf spot

A key pest
or pest complex

Grapes
Early cover sprays

Apply at bud swell, 1-inch shoot growth through first appearance of bloom.

Material
carbaryl
Comments
Larvae and adults can feed on foliage. Most serious damage occurs in the spring when adult beetles feed on newly swollen grape buds. If more than 4 percent of buds are damaged apply an insecticide.

Material
carbaryl
or malathion
Comments
These pests may be present anytime between 4- to 10-inch shoot growth and bloom. Scout twice weekly. Apply insecticides only when necessary.

Material
insecticidal soap
Comments
For insecticidal soap repeat application 3 to 4 days later up to day of harvest.

A key pest
or pest complex

Material
captan
or sulfur
or mancozeb
or myclobutanil
Comments
For powdery mildew, use myclobutanil or sulfur.
For downy mildew, use captan or mancozeb .
Captan and sulfur are only slightly effective against black rot.

Grapes
Bloom spray

Apply when caps begin to fall.

Comments
Wart-like galls found on leaves and galls on the roots may cause vine death or premature defoliation and retarded shoot growth.
Control of the root gall form of grape phylloxera can be achieved by using rootstocks derived from native American grapes.
There is no known completely successful chemical control for the root form of grape phylloxera.

A key pest
or pest complex

Grapes
Postbloom, summer cover to harvest sprays

Apply 7 to 10 days after bloom. Thereafter, sprays should be applied every 10 to 14 days.

Material
captan
or myclobutanil
or sulfur
Comments
Sulfur applications may injure plants if temperature exceeds 85 degrees Fahrenheit.

Material
carbaryl
or neem
Comments
Infestation includes grape berries being webbed together with silken threads and turning dark purple in color. Infested berries may drop from the stems when grapes are about the size of a pea. The larvae tunnel into the berries and feed internally. Several berries in a cluster may be affected. Infested vines should be sprayed at petal fall and again 7 to 10 days later.
Days between last application and harvest
Table 2

Material
carbaryl
or malathion
or pyrethrins and rotenone
or insecticidal soap
Comments
It is important to monitor for all insect pests after petal fall, and apply insecticide as needed. Refer to product label for specific insects and harvest restrictions.
Days between last application and harvest
Table 2

Material
carbaryl
or malathion
Comments
Rose chafer adults feed on blossom buds and leaves. Insecticide treatments should occur after bloom when the first adults are noticed, and if there are on average more than 2 beetles per vine. A second application in June might be needed.
Japanese beetle adults feed on the leaves and skeletonize the tissue. If about more that 15 percent of the leaves are damaged then an insecticide spray is recommended (high beetle populations may require repeated applications).
Days between last application and harvest
Table 2

G6010, revised October 2008