UCONN IPM: Integrated Pest Management:Tree Fruit:Apples:Weekly Pest Message

Fruit Pest Message
April 23, 2009

Hello Connecticut Fruit Growers,

This message includes information on oil sprays, apple scab, update on Lorsban (chlorpyrifos) labels, and a reminder for Tuesday’s twilight meeting.

Oil sprays on apples for European red mite and San Jose scale
It’s been a challenge to get an oil spray on between the weather and freezing temperatures at night. Oil can be used at the 2% rate (2 gal. per 100 gals. water) up until tight cluster. Reduce rate to 1% oil from tight cluster to early pink. Do not use oil within 10 days of a Captan application.

Apple Scab
I have a few Spectrum Instrument weather stations out in orchards again this year. I am able to determine apple scab infection periods, the percent apple scab spore maturity and degree days for apple scab maturity. The degree days for apple scab spore maturity are calculated with a base of 32 degrees F and start at 50% McIntosh green tip. I only have the report for one of the stations since the recent rain.

Location- Gales Ferry, CT- April 23, 2009- McIntosh ½ green to tight cluster

Green Tip – April 10

Dates of Apple Scab Infection since green tip – April 21-23

Spore Maturity – 9%

Apple Scab Degree Days – 209

Apple trees in Gales Ferry are about ½ green to tight cluster. Gales Ferry is one of the cooler spots in the state at this time of year due to proximity to the Long Island Sound. Many areas of the state are likely ahead of Gales Ferry in terms of tree development and spore maturity. If your apple trees were at green tip or beyond, and especially if you had apple scab in the orchard last year, you should have had a fungicide applied before this latest rain event.

Also in Gales Ferry, peaches were mostly in pink with a few petals starting on early nectarines; pears are at tight cluster.

Lorsban label confusion
There has been a lot of confusion regarding the use of Lorsban (chlorpyrifos) and the various generic chlorpyrifos products, particularly for use on apples. See below for a summary of the use of these products on apples. This was adapted from Art Agnello’s article in Scaffolds newsletter, dated April 20, 2009. For the entire article, including the use of Lorsban on other tree fruits, see http://www.nysaes.cornell.edu/ent/scafolds/2009/090420.pdf

Lorsban 4E (Dow) can be used in one of 3 ways: as a single foliar spray dormant/delayed dormant OR as single trunk spray dormant/delayed dormant OR as a single trunk spray post-bloom. No petal fall or post-bloom foliar sprays are allowed. The post-bloom trunk application of Lorsban 4E is now on the main label so you don’t need a supplemental label for this formulation anymore. Only 1 application of Lorsban 4E is allowed per year.

Lorsban Advanced (Dow), which is supposed to be a low-odor formulation, can be used as a single foliar spray dormant/delayed dormant OR as single trunk spray dormant/delayed dormant. No petal-fall or post-bloom applications (foliar or trunk) are allowed. Only 1 application of Lorsban Advanced allowed per year.

Lorsban 75 WG (Gowan) can be used as a single foliar spray dormant/delayed dormant OR at petal fall. One additional application of Gowan's Lorsban 75WG can be made post-bloom as a trunk spray. You are limited to a maximum foliar application of 2.67 lb. per acre of Gowan's Lorsban 75WG per year. However, this seasonal limit does not include the trunk spray, used at a rate of up to 2 lb. per 100 gal. of the Lorsban 75WG.

Various generic chlorpyrifos products, e.g. Whirlwind, Warhawk, Govern, and Nufos. Each have their own requirements and restrictions including the number of applications that can be made. None of them allow post-bloom trunk sprays on apples. You will need to consult those labels and follow carefully.

Last year some growers wondered if they could legally apply one formulation pre-bloom and then follow later with another formulation for borer control. This is not legal! Whatever product you use for your first spray becomes the label you must stick with for the rest of the season. If you apply a formulation that allows only 1 spray per season, you cannot legally follow it up with a foliar spray of another product or with a trunk spray of Gowan's Lorsban 75WG (which allows a second trunk spray on its label).

A label with new restrictions will appear on Gowan's Lorsban 75 WG as a result of the next factory production run. This material may not be in the market until next year. BOTTOM LINE – READ ALL PESTICIDE LABELS BEFORE USING!!!!!

Twilight Meeting Reminder-
Silverman’s Farm: Tuesday, April 28^th at 5:30 pm

451 Sport Hill Road, Easton, CT (203) 261-3306

Silverman’s Farm is a 35 acre pick-your own apple & peach orchard with a five acre petting zoo, a farm market, bakery and florist. Silverman’s main focus is agritourism the market features fresh baked pies, ice cream, primitive and traditional gifts, jams, jellies and of course apples. The orchard is primarily planted with 9’s and 26 root stock. We invite you to tour the orchard and grounds with us and enjoy some refreshments after the tour. The agriculture related representatives will be attending and will update you on the latest news and advancements in the industry.

Directions:

From New Haven
Take I95 south to Exit 38 (connector to the Merrit Parkway). Follow the connector to the Merrit Parkway (Rt. 15) south. Travel approx. 10 miles, to Exit 46 (Rt. 59 / Easton). Bear right off the ramp and proceed to the traffic light at Rt. 59. Turn left onto Rt. 59 (Sport Hill Rd.), heading north. After about 2 1/2 miles you'll see Silverman's Farm. (We're 1/2 mile past Hellen Keller Middle School.) Parking is available on the right side of the road.

From Waterbury
Take I84 west to Exit 10 (Church Hill Rd. / Newtown exit). Turn right at the end of the ramp onto Church Hill Rd. Take Church20Hill Road 1 mile to the flagpole. Turn left onto Rt. 25 south and continue for approximately 8 miles. Turn right onto Rt. 59 (southbound), and proceed about 4 miles to a stop sign at the intersection of Rt. 136. Turn left onto Rt. 59--Sport Hill Rd. Silverman's Farm is about 1 1/2 miles from this intersection. Parking is available on both sides of the road.

From Danbury
Take I84 east to Exit 9 (Rt. 25 / Newtown exit). Turn right onto Rt. 25 south. At traffic light turn left and continue on Rt. 25 south, for approx. 10 miles until you reach Rt. 59. Turn right onto Rt. 59 (southbound), and proceed about 4 miles to a stop sign at the intersection of Route 136. Turn left and continue on Rt. 59--Sport Hill Rd. Silverman's Farm is about 1 1/2 miles from this intersection. Parking is available on both sides of the road.

Lorraine

Lorraine Los
Fruit Crops IPM Coordinator
Plant Science Department, U-4067
University of Connecticut
Storrs, CT 06269-4067
(860)486-6449 (Phone)
(860)486-0682 (Fax)
Lorraine.Los@uconn.edu

The New England Tree Fruit Management Guide is available from the UConn Communications and Information Technology Office; U-4035; 1376 Storrs Rd.; Storrs, CT 06269 or call (860)486-3336. The cost is $35 which includes shipping and handling. The office will accept credit cards.

This information was developed for conditions in the Northeast. Use in other geographical areas may be inappropriate.

The information in this material is for educational purposes. The recommendations contained are based on the best available knowledge at the time of printing. Any reference to commercial products, trade or brand names is for information only, and no endorsement or approval is intended. The Cooperative Extension system does not guarantee or warrant the standard of any product referenced or imply approval of the product to the exclusion of others which also may be available.All agrochemicals/pesticides listed are registered for suggested uses in accordance with federal and Connecticut state laws and regulations as of the date of printing. If the information does not agree with current labeling, follow the label instructions. The label is the law.Warning! Agrochemicals/pesticides are dangerous. Read and follow all instructions and safety precautions on labels. Carefully handle and store agrochemicals/pesticides in originally labeled containers immediately in a safe manner and place. Contact the Connecticut Department of Environmental Protection for current regulations.The user of this information assumes all risks for personal injury or property damage.Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Kirklyn M. Kerr, Director, Cooperative Extension System, The University of Connecticut, Storrs. The Connecticut Cooperative Extension System offers its programs to persons regardless of race, color, national origin, sex, age or disability and is an equal opportunity employer.