What’s New In 2021 For Publication 360A – Crop Protection Guide for Apples

A full revision of Publication 360A, Crop Protection Guide for Apples will be available in Spring 2021 for download or purchase from Service Ontario. This will have the latest information on crop protection and resistance management for commercial production of apples. Subscribe to ONfruit.ca to receive updates when the guide will be available online and in print.

In the meantime, here is a list of new product additions, label expansions or changes to the apple guide.

New Registrations or Additions


Fungicides


Excalia (inpyrfluxam) is a Group 7 fungicide registered for the control of apple scab and powdery mildew at 146-219 mL/ha. Use with an organosilicone adjuvant (e.g., Xiameter) at a rate of 32-62 mL/100 L water if powdery mildew is the primary target. Do not use Excalia after petal fall. For resistance management, tank-mix with a compatible protectant apple scab fungicide from a different group. Preharvest interval (PHI): petal fall; Restricted entry interval (REI): 12 hours; Maximum # of applications per year (on label): 2 (max. 438 mL/ha).

Lifegard WG (Bacillus mycoides isolate J) is a Group P6 fungicide registered for the suppression of fire blight at a rate of 70-333 g/ha. Use the lower rate in 500 L of water and the higher rate in 1,000 L of water. Lifegard works by activating the tree’s defense mechanisms and is most effective when it is applied before infection occurs or when added to a rotation where disease control has been maintained by an effective fungicide program. Begin program at pink and re-apply again at petal fall into summer sprays. Lifegard may be toxic to bees. Do not apply during bloom or when bees are active in the orchard. Initial inducement of plant defense response occurs soon after application, but 3-5 days are required to attain maximum level of protection. Do not tank-mix with antibiotics (e.g., Streptomycin, Kasumin). Preharvest interval (PHI): 0 days; Restricted entry interval (REI): 4 hours; Maximum # of applications per year (on label): not stated on label.


Insecticides


Vayego 200 SC (tetraniliprole) is a Group 28 insecticide registered for the control of European apple sawfly, obliquebanded leafroller and codling moth at 225 mL/ha, oriental fruit moth at 300 mL/ha and suppression of mullein bug, plum curculio and apple maggot at 300 mL/ha. There are no tank-mix concerns with Vayego and strobilurins, copper or captan fungicides. This product is toxic to bees. Do not apply during bloom or when bees are active in the orchard. Preharvest interval (PHI): 7 days; Restricted entry interval (REI): 12 hours; Maximum # of applications per year (on label): 3.

Danitol (fenpropathrin) is a Group 3 insecticide registered for the control of apple maggot, codling moth, Japanese beetle, leafhoppers, obliquebanded leafroller, oriental fruit moth, tentiform leafminer and spring-feeding caterpillars at 0.78-1.55 L/ha. This product is highly toxic to beneficial insects and may lead to mite outbreaks. Maximum of 1 application per season. Use post-bloom is discouraged. Preharvest interval (PHI): 16 days; Restricted entry interval (REI): 24 hours (general re-entry), 7 days (scouting, hand pruning), 16 days (hand harvest), 23 days (thinning); Maximum # of applications per year (on label): 1.

Bioprotec PLUS (Bacillus thuringiensis) is a Group 11 insecticide that has replaced Bioprotec CAF for control of obliquebanded leafroller at 1.8-2.5 L/ha. Product must be consumed by the target insect to be effective. Apply in a high-volume spray to young larvae, early in infestation. Death of insect may take several days. Re-apply at 5-7-day intervals if activity is extended. Acidify spray mix to below pH 7 and apply on cloudy days or in the evening. Preharvest interval (PHI): 0 days; Restricted entry interval (REI): 4 hours; Maximum # of applications per year (on label): not stated on label.

Labamba (lambda-cyhalothrin) is a Group 3 insecticide with the same active ingredient as Matador 120 EC and Silencer 120 EC. It is registered for the control of rosy/green apple aphid, leafcurling midge, tentiform leafminer, codling moth, spring feeding caterpillar, obliquebanded leafroller and white apple leafhopper at 83 mL/ha and plant bugs, plum curculio and woolly apple aphid at 104 mL/ha. This product is highly toxic to beneficial insects and may lead to mite outbreaks. Use post-bloom is discouraged. Preharvest interval (PHI): 7 days; Restricted entry interval (REI): 24 hours; Maximum # of applications per year (on label): 3.

Poleci 2.5 EC (deltamethrin) is a Group 3 insecticide with the same active ingredient as Decis 5 EC. It is registered for the control of rosy/green apple aphid, mullein bug, plant bugs, spring feeding caterpillar, obliquebanded leafroller, white apple leafhopper at 400 mL/ha, leafcurling midge, codling moth and oriental fruit moth at 400-500 mL/ha and tentiform leafminer at 500 mL/ha. This product is highly toxic to beneficial insects and may lead to mite outbreaks. Use post-bloom is discouraged. Preharvest interval (PHI): 1 day; Restricted entry interval (REI): 12 hours; Maximum # of applications per year (on label): 3.

Aceta 70 WP (acetamiprid) is a Group 4A insecticide with the same active ingredient as Assail 70 WP. It is registered for the control of tentiform leafminer, white apple leafhopper and potato leafhopper at 80 g/ha, mullein bug at 80-160 g/ha, rosy apple aphid at 120 g/ha, plum curculio and apple maggot at 120-240 g/ha, codling moth at 170 g/ha, and European apple sawfly and oriental fruit moth at 240 g/ha. Repeated use of Group 4 insecticides may result in mite outbreaks. Preharvest interval (PHI): 7 days; Restricted entry interval (REI): 12 hours (general re-entry), 48 hours (scouting), 6 days (hand thinning); Maximum # of applications per year (on label): 4.

Velum Prime (fluopyram) is a Group 7 nematicide/fungicide with preventative, systemic and curative properties for the suppression of certain soil plant pathogenic nematodes and control of certain crop diseases such as powdery mildew. Apply in root zone through drip irrigation at a rate of 500 mL/ha beginning at planting. If Velum Prime has been used, fungicides from a different group should be applied for the first foliar fungicide application. Maintain a minimum 30-day interval between soil applications. Preharvest interval (PHI): 7 days; Restricted entry interval (REI): 12 hours; Maximum # of applications per year (on label): max. 1 L/ha.


Plant Growth Regulators


Novagib 10 L (gibberellins A4A7) is a plant growth regulator registered for russeting at 1.5-1.9 L/ha. Apply at 7-10 day intervals, beginning at petal fall. Do not apply in water volumes greater than 935 L/ha to reduce the risk of russet caused by spray water. When applied in the same season as prohexadione calcium (Apogee or Kudos), there may be reductions in efficacy of Novagib and/or prohexadione calcium. Do not add any kind of wetting adjuvant or surfactant unless you are sure of its crop safety. During wet or humid periods, use higher rate and shorten intervals between applications, particularly on large trees or susceptible cultivars. Do not use when temperatures are below freezing, above 30˚C or if rain is forecast within 6 hours. Novagib may reduce russeting caused by climatic factors during the first 30-40 days of development but cannot reduce russeting caused by pest, herbicide drift or phytotoxicity. Preharvest interval (PHI): 28 days; Restricted entry interval (REI): 12 hours; Maximum # of applications per year (on label): 5.

Label Expansions or Changes

Beleaf (flonicamid) is a Group 29 insecticide that has received label expansion for the suppression of plant bugs at the rate of 200 g/ha. Monitor for signs of feeding activity such as ooze near or on the flower buds. Do not use with adjuvants.

Two new FRAC groups have been classified:

  • BM (microbial) – contains biologicals with multiple modes of action including Bio-Save 10 LP (Pseudomonas syringae), Blossom Protect (Aureobasidium pullulans), Double Nickel LC (Bacillus amyloliquefaciens) and Serenade OPTI (Bacillus subtilis) which were previously not classified.
  • P7 – contains plant defence inducers, Aliette WG (fosetyl al) and Phostrol (mono- and dibasic sodium, potassium and ammonium phosphites) which were previously classified as Group 33.

Information on insect (woolly apple aphid, borer) and disease (apple scab, powdery mildew, fire blight, rust, Phythophthora, replant disease complex) susceptibility ratings of common apple cultivars and rootstocks have been included in the guide to assist with management of these pests.

Product Removal or Cancellations

Several fungicides and insecticides have undergone recent re-evaluations by the Pest Management Regulatory Agency (PMRA). Those products where registration will be cancelled in early spring of 2021, such as Admire 240 F / Alias 240 SC (imidacloprid), Clutch 50 WDG (clothianidin) and Actara 25 WG (thiamethoxam) have been removed – with the exception of Clutch and Actara for brown marmorated stink bug.

For more information on recent re-evaluation decisions important to apple growers, see the December 2020 Orchard Network Newsletter article, Re-Evaluation Round-Up: Updates on Recent Registration Decisions Impacting Apple Growers.


Kristy Grigg-McGuffin
Kristy Grigg-McGuffin

Horticulture IPM Specialist, OMAFRA