Nectarine leaf distortion
Shoot User
Hi there!
I was browsing on the net and found a great website with a key to Apple, Cherry, Peach and Nectarine diseases:
http://www.caf.wvu.edu/kearneysville/wvufarm6.html
By the discription that you gave of distorted leaves it seems that if you follow they key down you come to three possibilities:
9a. Leaves swollen and distorted along midrib early in the season, later turning red to purple, browning, and dropping from tree. Upper leaf surface becoming powdery-gray from fungal sporulation. Occasionally on fruit . PEACH LEAF CURL (Taphrina deformans)
9b. Leaves curled inward after several months. Water soaked spots turn red, necrotic and drop out giving leaves a tattered appearance. Localized areas or the entire canopy defoliates leaving foliage only at the tips. Choke cherry, the alternate host, may be seen near the orchard. Entire tree may show symptoms 2 to 3 years after the initial infection. X-DISEASE
9c. Leaves cupping upward, turning yellow, red, then dropping from localized areas of the canopy. PRUNUS STEM PITTING (Tomato Ring Spot Virus)
So of the above three which one does your nectarine match? Remember, you may need to wait longer into the season to see all of the symptoms as they may not all show at the same time.
Have a look at the website to see the key for yourself. If you click on the disease name in the key it will discribe it in detail and tell you how to manage it.
Good luck!
Replied: Friday 22nd of February 2008 11:31 AM