Orchard Disease and Insect Orchard Disease and Insect Control Update for 2008Control Update for 2008

Anne DeMarsayRegional Specialist, Fruit Pathology

Maryland Cooperative ExtensionUpper Marlboro, MD

What’s New for 2008 in Disease Control?

New fungicide labels

– Indar 2F (fenbuconazole) now registered for use on apple

– Adament 50 WG (tebuconazole + trifloxystrobin) now registered for use on

• Peach and nectarine• Cherry

What’s New for 2008 in Disease Control?

New footnotes, bearing apple orchards

– p. 68, 7th and 8th cover sprays, footnote 3 on Pristine: “Use of Pristine at this time may reduce the amount of postharvest rot.”

– p. 70, postharvest disease control, new footnote on Scholar 50W: reduced rate (6 oz in 25–100 gal) for blue mold and gray mold control now permissible in MD, VA, and WV

What’s New for 2008 in Disease Control?

New footnote, p. 32, Table 2 (risk classes)

– Apple scab isolates show a shift toward resistance to both SIs and strobilurins

– Rotate, use tank mixes, and limit applications!

Rally 40WSP replaces Nova 40W

– Same a. i. (myclobutanil) and EPA Reg. #

– Same rate, PHI, limit on applications

– Slightly different packaging

For control of powdery mildew, rusts, scab, flyspeck, and sooty blotch at 6–8 oz/A

Group 3 (sterol inhibitor): no more than 4 applications (32 oz/ac) per season

PHI: 14 days

Suggested use: on actively-growing, mildew-susceptible trees when FS/SB are active

Section 3 Supplemental Label on Plum & Prune

For control of brown rot (blossom blight and fruit rot) at 2 oz/A (like other stone fruits)

Group 3 (sterol inhibitor): no more than 4 applications per season

Use of a wetting agent (e.g. Latron B-1956, Latron CS-7) is recommended

PHI: 0 days

Label must be in user’s possession!

Adament 50 WG (Bayer) For control of a range of fungal diseases

on peach, nectarine, and cherry– Excellent control of brown rot (blossom blight

and fruit rot) and scab– Good to excellent control of rusty spot

Group 3 (sterol inhibitor) + Group 11 (QoI/strobilurin): no more than 4 applications (32 oz/ac) per season

PHI: 1 day

2008 Spray Bulletin Update

Chris Bergh

Winter Fruit Schools

February 18-22, 2008

Guthion Update

• 6 lb formulated per season in apples and pears

• 3 lb formulated per season in cherries• 14 day PHI in apple and pear• 15 day PHI in cherries• 14 day REI

New Products

• Delegate 25WG

• Beleaf 50SG

• Mustang Max 0.8EC

Generics

• Tombstone 2EC

• Lambda-Cy 1EC

• Perm-UP 3.2EC

• Perm-UP 25WP

Delegate 25WG (spinetoram)• Registered for all pome and stone fruit• Excellent for CM, OFM, leafrollers,

leafminers, thrips and pear psylla• Activity via contact and ingestion• Adjuvant improves activity against thrips,

leafminers and psylla• 4.5 – 7.0 oz/A, not to exceed 28 oz/A/season• 4-hour REI• PHI: 7 day on apple, pear, cherry, plum

14 day on peach and apricot 1 day on nectarine

• Suggested use: on 1st brood CM

Beleaf 50SG (flonicamid)

• Registered on all pome and stone fruit• Excellent against aphids, good against

tarnished plant bug and stink bugs• Activity via contact and ingestion, causing

feeding cessation• 2.0 – 2.8 oz/A, seasonal maximum 8.4 oz/A• 12-hour REI• PHI: 21-day on pome fruit

14-day on stone fruit

Mustang Max 0.8EC(zeta-cypermethrin)

• Registered on all pome and stone fruit

• Same rating as for all pyrethroids

• 1.28 – 4.0 fl oz/A, seasonal maximum of 24 fl oz/A

• 12-hour REI

• 14-day PHI

Tombstone 2EC (cyfluthrin)

• Generic of Baythroid (beta-cyfluthrin)• Registered for use on all pome and stone

fruit• Rated the same as for all pyrethroids• 1.4-2.8 fl oz/A, seasonal max of 2.8 fl oz/A

pome fruit and 5.6 fl oz/A on stone fruit• Minimum 100 gpa in pome fruit and 50 gpa

on stone fruit• 12-hour REI• 7-day PHI

Lambda-Cy 1EC(lambda-cyhalothrin)

• Generic of Warrior• Registered on all pome and stone fruit• Same rating as for all pyrethroids• 2.56 – 5.12 fl oz/A, seasonal maximum

of 1.6 pts/A• 24-hour REI• 21-day PHI on pome fruit• 14-day PHI on pome fruit

Perm-UP 3.2 EC and 25WP(permethrin)

• Generic of Ambush and Pounce• Registered on pome and stone fruit• Applications limited to pre-bloom in pear

and through petal-fall in apple• G-E aphids, E leafrollers, plant bugs,

leafminers, Japanese beetles• 2.56 – 5.12 fl oz/A, seasonal maximum

of 1.6 pts/A• 12-hour REI• 3-day PHI on cherry• 14-day PHI on peach and nectarine

Label Changes

• Pyrellin no longer available• Guthion seasonal maximum• Fujimite now called Portal• Intrepid now labeled for peach• Avaunt now labeled for peach• Acramite now labeled for cherries

Heads Up

• Onager EC miticide will be sold in the east for use on pome and stone fruit

• State registrations pending, expect product availability in 2008

• “…offers growers one-for-one performance on an AI basis with Savey, an easier to measure formulation and a more economical price.”

• Savey rated E for ERM and TSSM• 12-14 oz/A, one application per year

Heads Up

• Launch of Altacor 35WG (rynaxypr) expected in 2008

• New chemical class with excellent activity against lepidopteran larvae (OFM, CM, leafrollers, leafminers)

• New mode of action provides excellent resistance management opportunities

• Suggested use: in August against overlapping 3rd brood CM, 3rd-4th brood OFM, and 2nd brood TAB

Heads Up

• Launch of Belt 480SC (flubendiamide) expected in 2008

• Same class as Altacor• Excellent activity against lepidopteran

larvae• Will need to be careful about using

Altacor and Belt consecutively, or perhaps in the same season

Heads Up

• Launch of Movento 240SC (spirotetramat) expected in 2008

• Federal tolerances expected April-May

• pome and stone fruit• two-way systemic activity against

sucking insects (aphids, scale)

Heads Up

• EPA is conducting a risk assessment of endosulfan (Thionex) and assumes there is some occupational risk associated with its use in apple

• Apple industry could lose this product if EPA concludes that the benefits from its use are low

• USApple has solicited feedback and will respond to EPA

Important Reminder

• Imidan is very susceptible to degradation in alkaline water

• Ensure that spray water is at PH 6.5 or lower

• Vinegar can be used to buffer water, but effect is temporary

Anne DeMarsay, Ph.D.Regional Specialist, Fruit PathologyMaryland Cooperative Extension2005 Largo RoadUpper Marlboro, MD 20774-8508Phone: (301) 627-8440Fax:     (301) 627-3273Email:  fruitdr@umd.edu