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Publication 360, Fruit Production
Recommendations: Walnut Calendar - Prebloom
 Table
of Contents
- Prebloom
- Other information on walnuts
- Other information on nut crops
- Walnut Calendar (PDF
79 kb)
- Pub 360 Chapter 8 -Tree
Nuts (PDF 75 Kb)
- Related Links
Leafrollers
(Prebloom)
- Materials: Use one of:
- Dipel 2X DF @ 1.12 kg/ha
- Surround WP @ 50.0 kg/ ha
- Comments: Dipel: Apply when small larvae are
present. Apply in 600-800 L water/ha using an orchard air-blast sprayer.
Repeat in 7-10 days or after bloom if populations are large. Although
Dipel is not toxic to bees, avoid application during bloom. Use 1.6
kg/ha for large or mature trees. See Biopesticides
and reduced risk products for insect control, and notes
on Bacillus thuringiensis var. kurstaki.
Surround: Reduces damage due to leafrollers. Apply in 1,000 L
water/ha. Apply just prior to green tip or when larvae are first seen.
Make a first application before larvae roll up into leaves and a second
application 7 days later. Repeat at 7-14 day intervals as subsequent
generations emerge. See notes on Kaolin
Clay (Surround WP).
Aphids
(Prebloom)
- Materials: Use one of:
- Movento 240 SC @ 365 mL/ha
- Opal Insecticidal Soap @ 20 L/1,000 L water
- Comments: Most effective on young stages of aphids.
Movento: Has slow activity; control may not be apparent for 2-3
weeks. Under high pressure a second application may be necessary. Allow
at least 14 days between applications. Thorough coverage is necessary
for good control of aphid and scale pests. See label for recommendations
to prevent spray drift. Do not apply more than 1.58 L/ha/year.
Opal: Most effective on young stages of aphids. Apply 700-1,900
L of spray solution/ha. Spray to wetting but minimize runoff. Begin
applications when pests first appear. Repeat every 1-3 weeks as needed.
Apply Opal no more than 3 times; additional applications will increase
the risk of plant injury. Avoid application in direct sunlight.
San
Jose scale (Prebloom)
- Materials: Use one of:
- Movento 240 SC @ 585 mL/ha
- Opal Insecticidal Soap @ 20 L/1,000 L water
- Comments: Monitor scaffold branches for adult scale.
Spray when crawlers are active. Contact a crop IPM specialist for assistance
with timing sprays. See comments for aphids above.
Mites
(Prebloom)
- Materials: Use one of:
- Opal Insecticidal Soap @ 20 L/1,000 L water
- Comments: See comments on using Opal for aphids,
above.
Codling
moth (Prebloom)
- Materials: Use one of:
- Isomate-CFM/OFM TT @ 500 dispensers/ha
- Comments: Reduces mating of codling moth (CM). Initial
CM populations must be low for good results. Apply to blocks of walnut
or walnut/apple that are at least 4 ha in size. Timing is critical for
effective control. Apply pheromone dispensers to the upper third of
the tree canopy, before first flight of CM, no later than petal fall
of apples. Double the rate of dispensers at the edges of orchards. This
product lasts for up to 150 days for CM. See Using
mating disruption to control codling moth and oriental fruit moth (Isomate
CFM/OFM TT).
Precautions
Read the label and follow all safety precautions.
Consult the product label for suggested water volumes. Otherwise, use
enough water to ensure thorough spray coverage. Where the product rate
is listed in amount per 1,000 L and if a water volume is not provided
on the label, use enough water to wet the foliage to the near drip point.
For preharvest interval, re-entry period, maximum number of applications
and chemical group, see Table
8-1. Products Used on Nut Crops
Related Links
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
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