Weed Control Trials in Onions
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1 Weed Control Trials in Onions
2 Disclaimer regarding pesticides information: This report includes research results involving pesticides. It does not contain recommendations for their use, nor does it imply that the uses discussed herein have been registered. Pesticides must be registered by appropriate federal and state agencies before they can be recommended. Commercial companies and products are mentioned in this publication solely for the purpose of providing specific information. Mention of a company or product does not constitute a guarantee by the University of California or an endorsement over products of other companies not mentioned.
3 Treat ment Num ber Herbicide Rate Herbic Rate Herbicid Rate 1 Goal 2 oz/a Goal 2 oz/a Goal 6 oz/a 2 Goal 4 oz/a Goal 4 oz/a Goal 4 oz/a 3 Goal 6 oz/a Goal 6 oz/a 4 Goal 8 oz/a Goal 4 oz/a 5 Buctril 1 pt/a 6 Buctril 1.5 pt/a 7 Prowl 3.6 pt/a 8 Prowl 4.8 pt/a 9 Goal + Buctril 2 oz/a +.5 pt/a Goal 2 oz/a Goal 6 oz/a 10 Goal + Buctril 3 oz/a +.5 pt/a Goal 3 oz/a Goal 6 oz/a 11 Goal + Buctril 4 oz/a +.5 pt/a Goal 4 oz/a Goal 4 oz/a 12 Goal + Buctril 2 oz/a + 1 pt/a Goal 2 oz/a Goal 6 oz/a 13 Goal + Buctril 3 oz/a + 1 pt/a Goal 3 oz/a Goal 6 oz/a 14 Goal + Buctril 4 oz/a + 1 pt/a Goal 4 oz/a Goal 4 oz/a 15 Goal + Prowl 3 oz/a pt/a Goal 3 oz/a Goal 6 oz/a 16 Goal + Prowl 4 oz/a pt/a Goal 4 oz/a Goal 4 oz/a 17 Goal + Prowl 6 oz/a pt/a Goal 6 oz/a 18 Goal + Prowl 3 oz/a pt/a Goal 3 oz/a Goal 6 oz/a 19 Goal + Prowl 4 oz/a pt/a Goal 6 oz/a 20 Goal + Prowl 6 oz/a pt/a Goal 6 oz/a 21 Outlook 18 oz/a 22 Outlook 21 oz/a 23 Untreated 24 Untreated Application Timing, Date, and Onion Growth Stage 2 True Leaf Applied: 5/26/04 3 True Leaf Applied: 6/3/04 4 True Leaf Applied: 6/11/04 Broadleaf Weed Control Ratings 6/15/
4
5 Onion Yield vs. Early Season Onion Ground Cover 600 Onion Bulb Yield (cwt/a) Onion Ground Cover (%)
6 Onion Yield vs. Early Season Weed Control Onion Bulb Yield (cwt/a) Onion Bulb Yield (cwt/a) Weed Control Rating Rating
7 Continuing Issues Need improved consistency/crop safety Need to control very early emerged weed seedlings Need season long weed control Need some residual soil activity Need to translate results to chemigation
8 Chemigation Studies
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11 Aplication Date and Onion Gropwth Stage 6/1 6/6 6/9 6/13 # Herbicides Flag leaf to 1 true leaf 1.5 leaf 2 leaf 3 leaf 1 Goal XL Goal 2oz/A Goal 2oz/A 4 oz 2 Goal XL Goal 3 Goal + Buctril 4 Outlook + Goal 5 Outlook + Goal 6 Outlook + Goal + Buctril 21 oz/a + Goal 2oz/A Goal + 4 oz/a Goal 2oz/A Goal + 21 oz/a Goal + 4 oz/a + 21 oz/a 6 oz 6 oz 4 oz 6 oz 6 oz 7 Prowl + Goal 4 pts/a + Goal 2oz/A Goal 2oz/A 4 oz 8 Prowl + Goal + Outlook 4 pts/a + Goal 2oz/A oz/a Goal 2oz/A 4 oz oz/a 9 UTC (hand weeded weekly) 10 UTC
12 # Herbicides Aplication Date and Onion Gropwth Stage 6/1 6/6 6/9 6/13 6/26 Flag leaf to 1 true leaf 1.5 leaf 2 leaf 3 leaf Weed Control Rating (10=complete control) 1 Goal XL Goal 2oz/A Goal 2oz/A 4 oz Goal XL Goal 3 Goal + Buctril 4 Outlook + Goal 5 Outlook + Goal 6 Outlook + Goal + Buctril 21 oz/a + Goal 2oz/A Goal + 4 oz/a 6 oz oz 8.5 Goal 2oz/A 4 oz 9.5 Goal + 21 oz/a Goal + 4 oz/a + 21 oz/a 6 oz oz Prowl + Goal 4 pts/a + Goal 2oz/A Goal 2oz/A 4 oz Prowl + Goal + Outlook 4 pts/a + Goal 2oz/A oz/a Goal 2oz/A 4 oz oz/a UTC (hand weeded weekly) UTC 1.0
13 # Herbicides Aplication Date and Onion Gropwth Stage 6/1 6/6 6/9 6/13 6/26 Flag leaf to 1 true leaf 1.5 leaf 2 leaf 3 leaf Weed Control Rating (10=complete control) Onion Yield (cwt/a) 1 Goal XL Goal 2oz/A Goal 2oz/A 4 oz Goal XL Goal 3 Goal + Buctril 4 Outlook + Goal 5 Outlook + Goal 6 Outlook + Goal + Buctril 21 oz/a + Goal 2oz/A Goal + 4 oz/a 6 oz oz Goal 2oz/A 4 oz Goal + 21 oz/a Goal + 4 oz/a + 21 oz/a 6 oz oz Prowl + Goal 4 pts/a + Goal 2oz/A Goal 2oz/A 4 oz Prowl + Goal + Outlook 4 pts/a + Goal 2oz/A oz/a Goal 2oz/A 4 oz oz/a UTC (hand weeded weekly) UTC 1.0 0
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16 Figure 2. Visual representation of chemical distribution in a field resulting from chemication through solid set sprinklers. In this typical example, impact sprinklers with 7/64 nozzles were used with sprinklers spaced 40 along the lateral and 60 feet between laterals. Red lines illustrate location of the lateral pipe and the red stars indicate sprinkler head locations. The colors code for the percentage of chemical applied in each area of the field. Note some areas received as little as 50 % of the target application and other areas received nearly 200% of the average or target application. Improvements in sprinkler system design (sprinkler type and spacing) can greatly improve distribution uniformity and reduce over and under application Percentage of Target Chemical Applied
17 2007 Tulelake Herbicide Chemigation Trial in Dehydrator Onions Treat ment # Herbicide Application 1 true leaf 5/24/07 2 true leaf 6/4/ oz/a 4 oz/a oz/a oz/a 5.25 oz/a 2 pt/a 1.5 oz/a 7.9 oz/a 3 pt/a 2 oz/a 10.5 oz/a 4 pt/a 3 oz/a oz/a 6 pt/a 4 oz/a 21 oz/a 8 pt/a 2 oz/a 10.5 oz/a 2 oz/a 4 pt/a 4 pt/a 11 Hand Weeded Control 12 Non-weeded Control 2 oz/a 5.25 oz/a 3 oz/a 7.9 oz/a 4 oz/a 10.5 oz/a 6 oz/a oz/a 8 oz/a 21 oz/a 4 oz/a 10.5 oz/a 4 oz/a 4 oz/a 21 oz/a Mean LSD (0.05) CV%
18 2007 Tulelake Herbicide Chemigation Trial in Dehydrator Onions Treat ment # Herbicide Application Weed Control Rating (0-10, 10=100% control) 1 true leaf 5/24/07 2 true leaf 6/4/07 6/4/07 6/18/ oz/a 4 oz/a oz/a oz/a 2 oz/a oz/a 5.25 oz/a pt/a 1.5 oz/a 3 oz/a oz/a 7.9 oz/a pt/a 2 oz/a 4 oz/a oz/a 10.5 oz/a pt/a 3 oz/a 6 oz/a oz/a oz/a pt/a 4 oz/a 8 oz/a 7 21 oz/a 21 oz/a pt/a oz/a 4 oz/a 4 pt/a 4 pt/a 4 oz/a 21 oz/a 2 oz/a 4 oz/a 10.5 oz/a 10.5 oz/a Hand Weeded Control Non-weeded Control Mean LSD (0.05) CV%
19 2007 Tulelake Herbicide Chemigation Trial in Dehydrator Onions Treat ment # Herbicide Application Weed Control Rating (0-10, 10=100% control) Weeding Time (Man Hours/A) 1 true leaf 5/24/07 2 true leaf 6/4/07 6/4/07 6/18/07 6/20/ oz/a 4 oz/a oz/a oz/a 2 oz/a oz/a 5.25 oz/a pt/a 1.5 oz/a 3 oz/a oz/a 7.9 oz/a pt/a 2 oz/a 4 oz/a oz/a 10.5 oz/a pt/a 3 oz/a 6 oz/a oz/a oz/a pt/a 4 oz/a 8 oz/a 7 21 oz/a 21 oz/a pt/a oz/a 4 oz/a 4 pt/a 4 pt/a 4 oz/a 21 oz/a 2 oz/a 4 oz/a 10.5 oz/a 10.5 oz/a Hand Weeded Control * 12 Non-weeded Control Mean LSD (0.05) CV%
20 2007 Tulelake Herbicide Chemigation Trial in Dehydrator Onions Treat ment # Herbicide Application Weed Control Rating (0-10, 10=100% control) Weeding Time (Man Hours/A) Yield (cwt/a) 1 true leaf 5/24/07 2 true leaf 6/4/07 6/4/07 6/18/07 6/20/07 10/4/ oz/a 4 oz/a oz/a oz/a 2 oz/a oz/a 5.25 oz/a pt/a 1.5 oz/a 3 oz/a oz/a 7.9 oz/a pt/a 2 oz/a 4 oz/a oz/a 10.5 oz/a pt/a 3 oz/a 6 oz/a oz/a oz/a pt/a 4 oz/a 8 oz/a 7 21 oz/a 21 oz/a pt/a oz/a 4 oz/a 4 pt/a 4 pt/a 4 oz/a 21 oz/a 2 oz/a 4 oz/a 10.5 oz/a 10.5 oz/a Hand Weeded Control * Non-weeded Control Mean LSD (0.05) NS CV%
21 2007 Tulelake Herbicide Chemigation Trial in Dehydrator Onions Treat ment # Herbicide Application Weed Control Rating (0-10, 10=100% control) Weeding Time (Man Hours/A) Yield (cwt/a) 1 true leaf 5/24/07 2 true leaf 6/4/07 6/4/07 6/18/07 6/20/07 10/4/ oz/a 4 oz/a oz/a oz/a 2 oz/a oz/a 5.25 oz/a pt/a 1.5 oz/a 3 oz/a oz/a 7.9 oz/a pt/a 2 oz/a 4 oz/a oz/a 10.5 oz/a pt/a 3 oz/a 6 oz/a oz/a oz/a pt/a 4 oz/a 8 oz/a 7 21 oz/a 21 oz/a pt/a oz/a 4 oz/a 4 pt/a 4 pt/a 4 oz/a 21 oz/a 2 oz/a 4 oz/a 10.5 oz/a 10.5 oz/a Hand Weeded Control * Non-weeded Control Mean LSD (0.05) NS CV%
22 Figure 2. Visual representation of chemical distribution in a field resulting from chemication through solid set sprinklers. In this typical example, impact sprinklers with 7/64 nozzles were used with sprinklers spaced 40 along the lateral and 60 feet between laterals. Red lines illustrate location of the lateral pipe and the red stars indicate sprinkler head locations. The colors code for the percentage of chemical applied in each area of the field. Note some areas received as little as 50 % of the target application and other areas received nearly 200% of the average or target application. Improvements in sprinkler system design (sprinkler type and spacing) can greatly improve distribution uniformity and reduce over and under application Percentage of Target Chemical Applied
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