Plum varieties with some resistance to this disease include Shiro, Castleton, Santa Rosa, Methley, Early Italian, Fellenberg, Seneca, Damson, Blufree, NY9, Au Rosa and President. Very susceptible varieties include Stanley, Valor, Shopshire and Rosy Gage.
What is the most disease resistant plum tree?
‘ Japanese plums are generally less susceptible. ‘President’ is the only type of edible plum that is considered highly resistant.
What trees are resistant to black knot?
If you are going to plant a species of Prunus, find out if the tree you are interested in is susceptible to black knot. Often the tart cherries (Prunus cerasus, such as Evans Cherry) show good resistance to black knot.
What is the best fungicide for black knot?
The fungicide recommended for managing black knot on ornamental plantings is thiophanate-methyl (Cleary’s 3336) when dormant and at pink bud, full bloom, and three (3) weeks later. Follow label directions on the fungicide package. For trees used for fruit production, apply captan.
How do you control a black knot?
Fungicides can be used to protect young trees or trees that will be severely affected by black knot. Prune out any existing galls in late winter before applying fungicides in spring. Fungicide sprays must be applied in early spring to protect young green shoots.
How do you keep a black knot out of a plum tree?
Black knot can be controlled using a combination of prevention and sanitation.
- Remove all knots and swellings by pruning 3-4 inches below the knot during the dormant season before April 1st.
- Sterilize cutting shears with 70% rubbing alcohol to limit the spread of the disease.
What is the best plum tree to buy?
Victoria is by far the best known and popular mid season plum. It is self -fertile and a prolific cropper, useful both as a dessert and culinary plum but rather disease prone. Avalon is another large red plum which we would recommend.
Is a Methley plum self fertile?
Blooms in early spring, profuse with clusters of sweetly fragrant, delicate white flowers. Is self-fertile but should be planted in multiples to ensure a better crop. Works well as a pollinator for other early bearing Japanese varieties.
Does black knot spread to other trees?
The Lifecycle of Black Knot Fungus
During the wet periods of spring, the spores of the fungus get released. The spores are spread to other trees by the wind, where they infect young green shoots or wounded branches.
What is the best fungicide for plum trees?
Effective fungicides include fosetyl-al, which is applied to the leaves every 60 days, and mefenoxam, which can be applied in the early spring and fall. However, the best thing to do is prevent these fungal diseases by not overwatering and choosing a site with well-drained soil.
When should you cut out a black knot?
What can be done to control Black Knot?
- Prune out all knot-bearing branches during late fall, winter or very early spring when plants are dormant and knots are easy to see.
- Remove infected branches to at least 15-20 cm (6-8 inches) below knot.
Does copper fungicide work on black knot?
Sanitation measures usually control the disease adequately, but fungicides such as lime sulfur or tribasic copper sulfate may aid in the control of black knot. Several applications need to be made beginning before bloom and continuing until after fruit set. Fungicide use alone will NOT control the disease.
Can you cut black knot in summer?
Once a tree has Black Knot, you must prune out the galls if you want to try to control the disease. However, timing is critical! Prune only during the dormant season. Late fall to early winter or late winter to early spring is best.
Can you over water a plum tree?
You can easily overwater your plum trees. Plums grow poorly in wet soil. Too much water prevents roots from absorbing nutrients and oxygen. Avoid overwatering your trees by adjusting your approach to the weather conditions.
Does black knot affect the fruit?
The black knot fungus can infect American, European, and Japanese varieties of cultivated plums and prunes. Sweet, tart and Mahaleb cherries are also affected by the fungus, but are generally less susceptible than plum or prune. Occasionally, it may also infect apricots, peaches and other Prunus species.
What causes plums to rot on tree?
Brown rot is a fungal disease of apples, pears, plums, cherries and some other fruit and ornamental trees, causing a brown, spreading rot in fruit. It is caused by the same fungi that cause blossom wilt of the flowers and fruit spurs.
What is the best tasting plum?
Elephant Heart – mottled dark crimson colored skin, rich firm, red, juicy flesh. One of the best tasting plums with extremely sweet flavor. Japanese variety has clingstone fruit.
What is the most popular plum tree?
Santa Rosa Plum Tree: The most popular Plum tree for commercial use and home growing, the Santa Rosa produces tons of sweet, dark purple fruit.
What is the sweetest tasting plum?
Mirabelle plums
Mirabelle plums are the sweetest of all plum varieties. The small fruit with a slight reddish blush is popular for making eau-de-vie in France. Red plum varieties have bright red skin. Some, like the Santa Rosa, have amber flesh, while others, like Simcas, have bright red flesh that matches the skins.
What cross pollinates with a Methley plum?
It is self-pollinating, but cross pollinating with other Japanese plum trees will result in greater yield.
What pollinates a Methley plum tree?
The Methley tree requires 250 chill hours and does require another plum tree with which to pollinate, we recommend Santa Rosa. At maturity, it can reach a height and width between 18-20 feet.