Tom Lanini UC Cooperative Extension. This research was supported by the
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1 Update on Weed Control in Tomatoes Tom Lanini i UC Cooperative Extension This research was supported by the California i Tomato Research Institute t
2 New or Potential Tomato Herbicides id Sulfentrazone (Spartan) Submitted to EPA Carfentrazone (Shark) registered Pendimethalin (Prowl H 2 O) - registered
3 Spartan (Sulfentrazone) Submitted to the EPA by IR-4 Applied PRE-transplant 0.15 to 0.25 lb/a (4.8 to 8 oz/a Spartan 4F) Excellent broadleaf weed control and fair grass control long residual activity Slight injury to transplants and moderate to severe injury to direct seeded tomatoes Sensitive to soil and water ph high ph = more potential activity
4 Spartan lbs/a
5
6 Weed 4 Weeks Spartan 0.15 lbs/a Contro ol (%) Weed Nightshade Witchgrass Pigweed Purslane
7 Weed 4 Weeks Spartan 0.25 lbs/a Contro ol (%) Weed Nightshade Witchgrass Pigweed Purslane
8 Spartan PRE 015lb/ 0.15 lb/a
9 Spartan PRE 025lb/a 0.25
10 Spartan - Recrop Intervals Alfalfa Corn - 12 months - 10 months Cotton - 18 months Limas - Anytime Sunflower - Anytime Wheat - 4 months All others - 12 months
11 Shark (Carfentrazone) Applied PRE or to lb/a (0.33 to 1.33 oz/a of Shark) Excellent velvetleaf, nightshade, pigweed, and lambsquarters control No residual activity No recrop restrictions PRE 1 day before transplanting POST hooded sprayer
12 Weed 4 Weeks Shark lbs/a Post-shielded d Contro ol (%) Weed Nightshade Witchgrass Pigweed Purslane
13 Shark lbs/a Post-shielded d
14 Prowl H 2 O (Pendimethalin) Applied 0.95 to 1.42 lb/a (tomatoes) Less volatile than Treflan Moderate residual activity it 70 day PHI Good pigweed and grass control also may be good for dodder (based on alfalfa studies) Currently registered PRE in Transplant tomatoes or POST-directed in established tomatoes Supplemental label expires Dec. 31, 2010.
15 Prowl H 2 O 1.42 lbs/ac
16 Prowl H 2 O 0.95 lbs/ac
17 Weeds in Prowl H 2 O plots Prowl H 2 O plots 3 months after treatment 2 p Untreated Plots Purslane (0.75) Purslane (0.75) Puncture vine (0.50) Puncture vine (0.75) Black nightshade (0.25) Black nightshade (1.0) Redroot pigweed (0.75) Tumble pigweed (0.25) Tumble pigweed (1.0) Prostrate pigweed (0.75) Lambsquarters (0.50) Lambsquarters (0.75)
18 Weed control (%) after treatment in Processing Tomato ontrol (% %) Weed c Spartan 0.25 lb/a Matrix PRE 0.03 lb/a Matrix POST 0.03 lb/a Prowl H lb/a Jun 14-Jun 26-Jun
19 Late Season Weed Control (%) in Processing Tomato - August 9 Weed control (% %) Spartan 0.25 lb/a Matrix PRE lb/a Matrix POST 0.03 lb/a Prowl H lb/a Untreated
20 Hand Weeding Time (sec./50ft) in Processing Tomato 600 me (sec/5 0ft) Weeding ti Spartan 0.25 lb/a Matrix PRE lb/a 300 Matrix POST 0.03 lb/a 200 Prowl H lb/a Untreated 100 0
21 Yield of Processing Tomato (tons/ac) following PRE Herbicides Yield (tons/ac) 30 Spartan 0.15 lb/a Spartan 0.25 lb/a Matrix ti PRE003lb/ 0.03 lb/a Matrix POST 0.03 lb/a 15 Prowl H2O 0.95 lb/a 10 Prowl H2O 1.42 lb/a 5 Untreated 0 Direct seeded tomatoes
22 Matrix PRE lb/ac
23 Untreated
24 Fresh Tomatoes Transplanted trial
25 Staple lb/ac
26 Tomato Yield (lbs/5 plants) lants) Yie eld (lb bs/5 p Spartan Matrix Pre Matrix Post Prowl Untr
27 Tomato Yield (lbs/5 plants) lants) Hand weeded No hand weeding Yie eld (lb bs/5 p Spartan Matrix Pre Matrix Post Prowl Untr
28 Matrix PRE 4 WAT
29 Tomato Herbicide Summary Spartan Excellent transplant tomato tolerance and excellent weed control Prowl H 2 O Excellent transplant tomato tolerance and fair direct seed tolerance Good weed control controls dodder dd Matrix works best as a preemergence treatment when watered in with irrigation Excellent weed control Preemergence and Good weed control early Postemergence
30 Dodder Control with Resistant Varieties
31
32 Crop Rotation?? Susceptible crops Alfalfa Asparagus Carrot Onion Safflower Sugarbeet Melon
33
34
35 Dodder Resistant Tomatoes Processing tomato varieties shown to have resistance to dodder: C D X 233,, H9492,, H9553,, H9888, H9992, H9997, H1100, and PX 665
36 H9492 H9665
37 H9997 CXD 233 H1100 SVR
38
39 SVR
40
41 Prowl H 2 O PRE 0.95 lb/
42 Dodder Conclusions Use transplants and plant late (after May 15 th ) Tolerant varieties reduce dodder attachments and growth Matrix (rimsulfuron) and Sandea (halosulfuron) only marginally effective Combination of tolerant varieties and Prowl H 2 O applied preemergence is the most effective option
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