Exciting New Registrations for Pest Management in Onions

Transcription

1 // Cornell Cooperative Extension Vegetable Program Exciting New Registrations for Pest Management in Onions Christy Hoepting Cornell Cooperative Extension Vegetable Program Outline New Seed Treatments for Onion Maggot Resistance management strategy Fungicide components Actigard Dual Magnum New Seed Treatment for Onion Maggot Combination of two neonicotinoids : ratio of clothianidin (same active as Poncho) and imidacloprid (same active as Gaucho and Admire). Controls seedcorn maggots Available exclusively on Nunhem s onion varieties ie. Hendrix and Pulsar Only as part of a seed treatment package: CAPS C =Coronet, A =Allegiance, P =Pro Gro and S = How Do & Stack Up? ACTIVE INGREDIENT FI fungicides: Mefenoxan Fludioxonil Azoxystrobin Thiamethoxam (same as Crusier, Platinum, Actara) Thiamethoxam + spinosad FOR CONTROL OF Soil borne pathogens Beetles Aphids Onion Maggot Seed Corn Maggot LABELED FOR USE ON Several Crops Cucurbits Leafy Brassicas Carrots Onions, all varieties

2 // Rank How Do & Stack Up? B. Nault et al. (Cornell University) to 9 No. of Average OM Insecticide (a.i) Comments Trials control Regent*/Mundial ST * 9% ST + Lorsban IF 9% Poncho*/ ST 9% Entrust*/Regard ST* 7 % % Provided significantly better control than.% of the time Provided significantly better control than alone 6% of the time Trial conducted under very high pressure. provided % and 7% control in this trial Avicta ST* % Also controls nematodes 6 ST % 7 Lorsban IF 6% Did not provide significant control over 6% of the time Did not provide significant control over % of the time Gaucho* % Did not provide control of onion thrips in NY Resistance Management Onion maggot is notorious for developing resistance Organochlorines, Carbamates and OPs, including Lorsban (resistance never confirmed, but efficacy noticeably declined in many fields) Onion maggot can develop resistance within years of continuous exposure 9 Cruiser*.6% Did not provide control of onion thrips in NY ST: seed treatment; IF: in furrow treatment. trial conducted by C. Hoepting,. *not labeled for use on onion. Resistance Management Once resistance has developed Population can become controllable after eliminating exposure for a few years Resistance will occur faster with resumed continuous exposure Lack of interest from chemical companies to pursue registrations for onion maggot control. Imperative to preserve the useful life of and. Trade Name Diazinon AG Diazinon WP Etc. Lorsban E, 7WG, Advanced and OLF Company Active Ingredient for OM Chemical Class (IRAC group) Makhteshim diazinon OP () Dow AgroSciences (Lorsban), other companies for OLF Chlorpyrifos OP () Application Pre plant broadcast & incorporate At planting infurrow, Post planting banded spray over row Syngenta Cyromazine Triazine (7) Seed treatment Insecticide Roster for Onion Maggot in NY: Bayer Crop Sciences Clothianidin + imidacloprid Neonicotinoid () + Neonicotinoid () Seed treatment Thiamethoxam Neonicotinoid () Syngenta Seed treatment + spinosad + Spinosyn () OLF: other labeled formulation such as Warhawk. IRAC: Insecticide resistance action committee Resistance management Follow a resistance management strategy Rotate among chemical classes on all acreage every year on Nunhem s varieties only Rotate the ground from year to year that is cropped to Nunhem s varieties Use every other year Do not use Lorsban in furrow in combination with seed treatment. Onion Maggot Rotation Plan Field Field Field Field Continue to use on Nunhem s varieties (rotate ground that had /Nunhem s in ) Experiment with on as much acreage as you feel comfortable Side by side comparisons with & without Lorsban Remaining acreage: (+Lorsban IF) Reminder! Add Pro Gro for smut to &

3 // Onion Maggot Rotation Plan Field Field Field Field on all acreage (except Nunhem s varieties, ideally on acreage) Verdict will be in on need for Lorsban Reminder! Add Pro Gro for smut to & Onion Maggot Rotation Plan Field Field Field Field (+ Lorsban IF) on all acreage Reminder! Add Pro Gro for smut to & Onion Maggot Rotation Plan Field Field Field Field Make sure you have Onion Smut Protection! Make sure you have Onion Smut Protection! Nunhem s seed treatment package (CAPS) includes Pro Gro does not provide control of onion smut add Pro Gro Mancozeb in furrow is still recommended in addition to both of these seed treatments for adequate onion smut control. Trade Name Coronet (BASF) Allegiance (Bayer) Pro Gro (Chemtura) (Bayer) Fungicide Seed Treatment Package: Nunhem s CAPS Active Ingredient Pyraclostrobin + boscalid FRAC group 7 Disease Controlled Onion Smut Damping Off Other No Metalaxyl No Thiram + carboxin Clothianidin + imidacloprid M 7 Insecticides ~ % control Rhizoctonia solani Pythium spp. Pythium spp. Botrytis allii Aspergillis spp. Penicillium spp. Fusarium spp. Botrytis allii Penicillium spp. For onion maggot control (~9% control) same actives as Pristine. metalaxyl = mefanoxam (Apron). FRAC: Fungicide resistance action committee. for %+ control of onion smut, include mancozeb in furrow with Pro Gro treated seed.

4 // Trade Name Fungicide Seed Treatment Package: Active Ingredient FRAC: Fungicide resistance action committee. FRAC group Onion Smut Apron Mefanoxam No Disease Controlled Damping Off Pythium spp. Maxim Fludioxonil No Rhizoctonia solani Quadris Azoxystrobin No No Other Fusarium spp. Regard Spinosad Insecticide No For onion maggot control Crusier Thiamethoxam insecticide No Does not control onion maggot New Fungicide Registrations in Actigard, Syngenta a.i. acibenzolar s methyl Non pesticidal compound and inducer of plant resistance Suppression of Iris Yellow Spot Virus, Xanthomonas leaf blight (bacterial disease) and Downy Mildew.7 oz weeks pre bulb for bacterial disease and 6 weeks pre bulb for IYSV Maximum oz per season Does Actigard work? Actigard Actigard: IYSV Colorado: Schwartz Xanthomonas Leaf Blight Actigard reduced disease 9 % compared to weekly copper/ebdc spray Downy Mildew: Compared to, reduced incidence by % Yield: consecutive sprays did reduce yield in CO consecutive sprays did not reduce yield in NY no effect on yield with sprays % IYSV 7 6 Colorado: Schwartz, Actigard Actigard Actigard trial trial trial control Actigard.7 oz apps Induced Resistance Inoculated Field Trial: Elba, NY New Fungicide Registrations for % bacterial bulb rot (pre storage) spray applied days prior to inoculation b. Not Inoculated.6 a Untreated (water) cv. Red Bull, transplanted onions, Pantoea ananatis a 7% control b 9. b. not inoculated control (water) Actigard Employ Regalia Actigard Employ Regalia Beer & Hoepting,, Syngenta a.i. difenoconazole (FRAC group ) = Inspire + cyprodinil (FRAC group 9) = Vangard Control of PB, BLB, suppression of black mold Use with an adjuvant such as Induce Make no more than sequential applications before switching to a different mode of action Cannot be used as rotation partners: Scala (9), Switch (9+), Vangard (9), Tilt (), Quilt Xcel (+), (+)

5 // New Fungicide Registrations in, Syngenta a.i. azoxystrobin (FRAC group ) = Quadris + difenoconazole (FRAC group ) = Inspire Control of PB/SLB and BLB Make no more than sequential applications before switching to a different mode of action Cannot be used as rotation partners: Tilt (), Quilt Xcel (+), Quadris (), Pristine (+7), Cabrio (), (+9) Number BLB Lesions per Leaf a UNTREATED in New York: Hoepting 6. a ELBA: Botrytis leaf Blight (Jul 7, ).9 c.6 b INSPIRE SUPER QUADRIS INSPIRE SUPER + BRAVO ALT. QUADRIS. bc INSPIRE SUPER + ACTIGARD ALT. QUADRIS.7 b p value =..6 bc % control. c BRAVO/ Number BLB Lesions per Leaf..... in New York: Hoepting.9 a UNTREATED PEMBROKE: Botrytis Leaf Blight (Aug, ). c. ab. cd INSPIRE SUPER QUADRIS INSPIRE SUPER + BRAVO ALT. QUADRIS. d INSPIRE SUPER + ACTIGARD ALT. QUADRIS. c p value =. transformation: log (x+). bc % control.9 cd BRAVO/ 6 in New York: Hoepting 97 ELBA & PEMBROKE: Botrytis Leaf Blight RANK SCORE UNTREATED INSPIRE SUPER QUADRIS INSPIRE SUPERINSPIRE SUPER + BRAVO ALT. + ACTIGARD QUADRIS ALT. QUADRIS BRAVO/ 6 in New York: Hoepting 97 ELBA & PEMBROKE: Botrytis Leaf Blight RANK SCORE UNTREATED INSPIRE SUPER QUADRIS INSPIRE SUPERINSPIRE SUPER + BRAVO ALT. + ACTIGARD QUADRIS ALT. QUADRIS BRAVO/ Number Downy Mildew Lesions per Plant 6 in New York: Hoepting. a UNTREATED PEMBROKE: Downy Mildew (Sep ).9 b 96% control % control.9 c 9% control. cd.9 cd. cd. ef. f INSPIRE SUPER QUADRIS INSPIRE SUPER + BRAVO ALT. QUADRIS INSPIRE SUPER + ACTIGARD ALT. QUADRIS p value =. transformation: log (x+) BRAVO/

6 // in New York: Hoepting Downy Mildew Number Downy Mildew Lesions per Plant 6 PEMBROKE: Downy Mildew (Sep ). a 96% control.9 b % control 9% control. cd.9 cd. ef. f UNTREATED INSPIRE SUPER QUADRIS INSPIRE SUPER INSPIRE SUPER + BRAVO ALT. + ACTIGARD QUADRIS ALT. QUADRIS p value =. transformation: log (x+).9 c. cd BRAVO/ Downy Mildew is Chased by Purple Blotch Downy mildew is invaded by secondary pathogens including Purple Blotch Number Purple Blotch Lesions per Plant... in New York: Hoepting.9 a PEMBROKE: Purple Blotch (Sep, ). a % control.76 bc.6 cd. cd UNTREATED INSPIRE SUPER QUADRIS INSPIRE SUPER INSPIRE SUPER + BRAVO ALT. + ACTIGARD QUADRIS ALT. QUADRIS 9% control.9 d p value =. transformation: log (x+).66 bc. b BRAVO/ 6 6 in New York: Hoepting 7 ELBA & PEMBROKE: Final for All Diseases 7 UNTREATED INSPIRE SUPER QUADRIS INSPIRE SUPERINSPIRE SUPER + BRAVO ALT. + ACTIGARD QUADRIS ALT. QUADRIS BRAVO/ UNTREATED in New York: Hoepting PEMBROKE: for Plant Health & Yield 6 INSPIRE SUPER QUADRIS INSPIRE SUPER + BRAVO ALT. QUADRIS INSPIRE SUPER + ACTIGARD ALT. QUADRIS BRAVO/ 6

7 // in New York: Hoepting FINAL (EVERYTHING) UNTREATED INSPIRE QUADRIS SUPER INSPIRE INSPIRE SUPER + SUPER + BRAVO ALT. ACTIGARD QUADRIS ALT. QUADRIS 7 BRAVO/ Summary Do not use alone Mancozeb applied preventatively provides good control of downy mildew Actigard included in the tank mix appeared to enhance control of all leaf diseases Especially downy mildew appears to have a good fit in the onion leaf disease spray program Plant health Suppression of downy mildew Be mindful of rotation restrictions with Inspire Super and Rotation Sequence for. Bravo (M) for BLB on small onions for first sprays.. (+9) + Bravo (M) for BLB + PB for consecutive sprays.. Bravo (M) for BLB or Rovral () for BLB + PB for spray.. (+) + Bravo. pts (M) for PB + BLB for spray.*. Rovral () for BLB + PB for spray. 6. (+9) + Bravo (M) for BLB + PB + suppress Black Mold for up to sprays. *If spray season is short, skip # and # and go straight to #6 in sequence. New Fungicide Registrations in Quilt Xcel, Syngenta a.i. azoxystrobin (FRAC group ) = Quadris + propiconazole (FRAC group ) = Tilt Control of PB (low rates) and BLB & DM (high rates) Make no more than sequential applications before switching to a non group fungicide Cannot be used as rotation partners: Quadris (), (+), Pristine (+7) and Cabrio (). New Fungicide Registrations in Presidio, Valent a.i. fluopicolide (FRAC group B) Control of downy mildew (DM) Apply only in a tankmix with another labeled fungicide with a different mode of action (i.e. mancozeb) Make no more than sequential applications before switching to a different mode of action New Herbicide Registration in Dual Magnum, Syngenta a.i. metalochlor for yellow nutsedgecontrol Section (c) Special Local Needs (indemnified) Apply Dual Magnum up to. pt as late as possible in the fall before the ground freezes. Incorporate Dual Magnum to a shallow depth of no greater than inches In the following spring, do not disturb soil below the depth of Dual Magnum incorporation this could drastically reduce the efficacy of Dual Magnum 7

8 // New Herbicide Registration in Fall Applied Dual Magnum Dual Magnum, Syngenta Be aware that fall applications of Dual Magnum may cause reduced stand and plant size in the following crop. Enjoy significantly reduced yellow nutsedge pressure and possibly higher onion yields Webster muck: June, Fall Applied Dual Magnum Questions? Fall Dual Untreated Potter muck: June, For more information, contact Christy Hoepting 7 69; cah9@cornell.edu