Andrew MacRae and Joseph Noling University of Florida/IFAS GCREC and CREC
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1 Methyl Bromide Alternatives Research Update Andrew MacRae and Joseph Noling University of Florida/IFAS GCREC and CREC
2 Current Research Long term sustainability of methyl bromide alternatives Year 3 initiated August 2010 Evaluation of all components of the 3-WAY fumigant system Spring 2009 Spring 2010 Fall 2010
3 Current Research Impact of cultivation and herbicides on the control of yellow and purple nutsedge and their impact on the selection of a tomato fumigant system Fall 2010 through Spring 2011 Interaction of Paladin Pic Concentration via Drip Tape Applications and the movement and control of purple nutsedge Fall 2010 and Spring 2011
4 Current Research Evaluation of herbicide combinations for use in tomato Reflex (Fall 2009, Spring 2010, Fall 2010) Matrix / Solida + Envoke + Sandea (Fall 2010 and Spring 2011) Competition of common purslane with tomato Fall 2010 and Spring 2011 Evaluation of new polyethylene mulch technology Fall 2009, Spring 2010, Fall 2010
5 Evaluation of the long term sustainability of methyl bromide alternatives
6 Long Term Sustainability Trial Split-Split Plot design with a randomized complete block arrangement with four replications First crop main treatment = Primary fumigation 1 st split plot Crop (Tomato or Pepper) 2 nd split plot Herbicide or No herbicide Double crop main treatment = Secondary fumigation The trial design randomization will be maintained the same for the length of the study (3 years) to determine sustainability of the treatments
7 Trial Design cont. Plot size Initial fumigation is 3 beds x 300 ft. long 1 st split plot - 3 beds x 150 ft. long 2 nd split plot - 3 beds x 75 ft long Secondary fumigation is 1 bed x 300 ft. long Plant beds are on a 5 ft. spacing with a 28 in. bed top and 9 in. bed height
8 Cropping System Years 1-3 Primary Crop (Summer): Tomato/Pepper (transplanted) Secondary Crop (Spring): Summer Squash (seeded) Grown in a plasticulture system using drip irrigation Cultivars Security 28 tomato Patriot pepper Gentry summer squash
9 Treatments Initial Fumigation 1. Non-treated control 2. Methyl Bromide 67:33 at 175 lbs/a 3. 3 Way = Telone II at 12 gal/a + Chloropicrin at 150 lbs/a + KPam at 60 gal/a 4. 2 Way = Telone II at 12 gal/a + Chloropicrin at 150 lbs/a 5. Midas 50:50 at 160 lbs/a 6. Paladin Pic 79:21 at 60 gal/a
10 Treatments Secondary Fumigation 1. Non-treated control 2. Inline at 35 gal/a (EC formulation of Telone C35) 3. Kpam at 60 gal/a
11 Herbicide Treatment Each treatment had a split plot of herbicide or no herbicide Year 1 = V10142 (0.3 lbs ai/a) and Devrinol (1 gal/a) Year 2 = Reflex (1 pt/a) and Devrinol 2 EC (1 gal/a) Year 3 = Reflex (1 pt/a) and Devrinol 2 EC (1 gal/a) The herbicides were applied to a final finished bed top prior to laying plastic mulch Year 1 = Canslit Metalized Year 2 = Filmtec 1.2 mil VIF Year 3 = Pliant Blockade 1.1 mil VIF
12 Insurance Policy Against Weeds For all methyl bromide alternatives, the use of herbicides is an insurance policy Fumigant control (%) Herbicide Control (%) Total Control (%) 50 70% of 50% = = % of 40% = = % of 30% = = % of 20% = = % of 10% = = 97
13 Application Procedures 1 st Crop The field was prepared using conventional tillage Telone II treatments were applied to a depth of 12 in. below bed top A pre-bed was pulled and then shaped using a 3-row rig The fumigants MB 50:50, Midas 50:50, Paladin Pic, and Chloropicrin were applied via shank at an 8 in. depth Beds were sealed using a bedpress, herbicides were applied, and then VIF mulch was applied using a speedroller Kpam treatments were applied via injection through a double drip tape system
14 Tomato Tomato
15 Tomato Year 1 - Annual Grass Count P l a n t s / A With Herbicide No Herbicide Control MB 3-Way 2-Way Midas Paladin Pic
16 Tomato Year 2 - Annual Grass Count P l a n t s / A With Herbicide No Herbicide Control MB 3-Way 2-Way Midas Paladin Pic
17 Tomato Year 1 Purple Nutsedge Count P l a n t s / A With Herbicide No Herbicide Control MB 3-Way 2-Way Midas Paladin Pic
18 Tomato Year 2 Purple Nutsedge Count P l a n t s / A With Herbicide No Herbicide Control MB 3-Way 2-Way Midas Paladin Pic
19 Tomato Year 1 Marketable Yield 1400 B o x e s / A With Herbicide No Herbicide Control MB 3-Way 2-Way Midas Paladin Pic
20 Tomato Year 2 Marketable Yield B o x e s / A With Herbicide No Herbicide Control MB 3-Way 2-Way Midas Paladin Pic
21 Summary Paladin Pic does not control goose grass The addition of a herbicide provided 60 70% control of the annual grasses The additional herbicide helped purple nutsdege control in both years All systems provided satisfactory control of purple nutsedge
22 Summary Cont. In both years, the addition of herbicide increased some fumigant program s marketable yields The three way system has consistently good yields
23 Evaluation of all components of the 3-WAY fumigant system for tomato production
24 Treatments Fumigant Rate (Broadcast) Placement 1 Telone II 12 gal/a 12 inches 2 Chloropicrin 150 lbs/a 8 inches 3 KPam 60 gal/a Drip applied 4 Chloropicrin + KPam 5 Telone II + KPam 6 Telone II + Chloropicrin 7 Telone II + Chloropicrin + KPam 8 PicClor lbs/a 8 inches 9 PicClor 60 + KPam 10 Telone C35 35 gal/a 8 inches 11 Telone C35 + KPam 12 Non-treated Control All treatments were placed under VIF (Filmtec 1.2 mil or Blockade 1.1 mil) and LDPE (Pliant 1.0 mil) plastic mulches
25 2-WAY Purple Nutsedge Control
26 2-WAY Marketable Yield
27 Telone + Pic VIF Control VIF Telone + Pic LDPE Control LDPE
28 Telone C35 VIF Control VIF Telone C35 LDPE Control LDPE
29 PicClor 60 VIF Control VIF PicClor 60 LDPE Control LDPE
30 3-WAY Purple Nutsedge Control
31 3-WAY Marketable Yield Yields were reduced in VIF due to Kpam injury, i.e. we planted too soon after application
32 3-WAY VIF Control VIF 3-WAY LDPE Control LDPE
33 Telone C35 + KPam VIF Control VIF Telone C35 + KPam LDPE Control LDPE
34 PicClor 60 + KPam VIF Control VIF PicClor 60 + KPam LDPE Control LDPE
35 Herbicide Resistance Resistance develops most rapidly when one control method is used repeatedly over multiple growing seasons In tomatoes we are protected from developing our own resistance with the use of tillage in the fallow period and the option of multiple herbicide mode of actions Movement of resistant weeds may occur from agronomic fields to tomato fields, especially in North Florida
36 Herbicide Resistance Palmer Amaranth, a large pigweed commonly found in north Florida and throughout the Southeast, has shown multiple resistance to: Glyphosate (Roundup type products) ALS (Sandea, Matrix, Envoke) Palmer Amaranth has shown resistance to : Triazines (possible cross resistance to metribuzin) Dinitroanalines (Prowl H2O) Current control strategies in cotton rely on the use of other herbicide modes of action Acetomides (Dual Magnum) PPOs (Chateau, Reflex)
37 Number of cases Reported cases of herbicide-resistant weeds in US
38 Herbicide Resistant Weeds Source: J.L. Gunsolus. Herbicide Resistant Weeds North Central Region Extension Publicati
39 Herbicide Resistant Weeds
40 Do I Have A Resistance Problem? Weed size Moisture Temperature Weather Rate Agitation Nozzle type Nozzle wear GPA Calibration Bad luck Resistance
41 Questions? Andrew MacRae University of Florida - GCREC
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Additional index words. Virtually impermeable film, Telone C-35, InLine, plasticulture, soil fumigation, methyl bromide alternatives.
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