Copper sprays can be effective if applied during dormancy
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Distorted and blistered leaves are signs of peach leaf curl.
Now is the time to spray peach and nectarine trees to control it. (Photo courtesy UC Statewide Integrated Pest Management) |
It may be Thanksgiving, but it’s time to talk peaches. In particular, this conversation is about peach leaf curl.
This common fungal disease only attacks peach and nectarine trees. It distorts and puckers foliage and new shoots. It can completely defoliate a tree, leaving any developing fruit to sunburn or shrivel. Over time, it greatly cuts down on a tree’s productivity.
And it comes back, year after year after year. Once it’s established, peach leaf curl will be an issue every spring.
The time to combat this fungus is not when you see its damage in April or May; it’s now, in the days before and after Thanksgiving.
To control leaf curl, peach and nectarine trees benefit from dormant spraying with a copper fungicide or copper soap. Horticultural oil helps make that copper spray stick to the twigs and branches.
According to the UC Integrated Pest Management Program, the copper spray smothers the fungal spores that overwinter on the tree.
“The fungal spores that cause the disease spend the winter on twigs and buds and germinate in the spring,” say the IPM experts. “For effective control, treat trees just after leaves have fallen, usually late November or December.
"A second application in late winter before buds swell can be considered, especially in areas with high rainfall or during wet winters. Don’t apply fungicides during the growing season because they won’t be effective.”
A dry, calm and fogless almost-winter day; that’s the perfect time to spray. And that’s also the forecast for the greater Sacramento area this Thanksgiving weekend and early next week. Copper sprays need 24 hours of dry, calm weather before and after application. This is a good window of spraying opportunity.
If needed, prune before spraying. Pick up any dropped foliage and discard (don’t compost). Those fallen leaves may carry leaf curl, too.
For more on treating peach leaf curl: http://ipm.ucanr.edu/QT/peachleafcurlcard.html
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Garden Checklist for week of Nov. 3
November still offers good weather for fall planting:
* If you haven't already, it's time to clean up the remains of summer. Pull faded annuals and vegetables. Prune dead or broken branches from trees.
* Now is the best time to plant most trees and shrubs. This gives them plenty of time for root development before spring growth. They also benefit from fall and winter rains.
* Set out cool-weather annuals such as pansies and snapdragons.
* Lettuce, cabbage and broccoli also can be planted now.
* Plant garlic and onions.
* Keep planting bulbs to spread out your spring bloom. Some possible suggestions: daffodils, crocuses, hyacinths, tulips, anemones and scillas.
* This is also a good time to seed wildflowers and plant such spring bloomers as sweet pea, sweet alyssum and bachelor buttons.
* Rake and compost leaves, but dispose of any diseased plant material. For example, if peach and nectarine trees showed signs of leaf curl this year, clean up under trees and dispose of those leaves instead of composting.
* Save dry stalks and seedpods from poppies and coneflowers for fall bouquets and holiday decorating.
* For holiday blooms indoors, plant paperwhite narcissus bulbs now. Fill a shallow bowl or dish with 2 inches of rocks or pebbles. Place bulbs in the dish with the root end nestled in the rocks. Add water until it just touches the bottom of the bulbs. Place the dish in a sunny window. Add water as needed.
* Give your azaleas, gardenias and camellias a boost with chelated iron.
* For larger blooms, pinch off some camellia buds.
* Prune non-flowering trees and shrubs while dormant.
* To help prevent leaf curl, apply a copper fungicide spray to peach and nectarine trees after they lose their leaves this month. Leaf curl, which shows up in the spring, is caused by a fungus that winters as spores on the limbs and around the tree in fallen leaves. Sprays are most effective now.
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