Weed Control in Tomatoes and Peppers
Weed Control in Tomatoes and Peppers
Weed Control in Tomatoes and Peppers
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Tomato <strong>and</strong> Pepper Scout Tra<strong>in</strong><strong>in</strong>g<br />
<strong>Weed</strong> <strong>Control</strong> <strong>in</strong> <strong>Tomatoes</strong><br />
<strong>and</strong> <strong>Peppers</strong><br />
Darren Rob<strong>in</strong>son<br />
Dual+Sencor (PPI)<br />
• Advantages<br />
• Weaknesses<br />
S<strong>in</strong>gle application<br />
Residual grass <strong>and</strong><br />
broadleaf control<br />
<strong>in</strong>clud<strong>in</strong>g EBN<br />
Can set back<br />
transplants – low OM<br />
Triaz<strong>in</strong>e tolerant weeds<br />
escape<br />
1
Dual <strong>in</strong>jury on tomatoes<br />
Sikkema RC<br />
Sencor <strong>in</strong>jury on tomatoes<br />
Sikkema RC<br />
2
Treflan+Dual+Sencor<br />
• Advantages<br />
• Weaknesses<br />
Residual broadleaf<br />
control<br />
<strong>Control</strong> of triaz<strong>in</strong>e<br />
tolerant lambsquarters*<br />
Can set back transplants<br />
– shallow plant<strong>in</strong>g<br />
Less residual control of<br />
EBN<br />
Untreated check<br />
Treflan (0.84 L/ac) + Dual (0.5 L/ac)<br />
+ Sencor (0.4 L/ac) Rob<strong>in</strong>son RC<br />
3
Treflan<br />
<strong>in</strong>jury on<br />
tomatoes<br />
Sikkema RC<br />
Yield loss caused by Treflan + Dual Magnum + Sencor<br />
(PPI) <strong>in</strong>creased as transplant<strong>in</strong>g depth decreased<br />
0.5 <strong>in</strong><br />
1 <strong>in</strong><br />
2 <strong>in</strong><br />
4 <strong>in</strong><br />
0 10 20 30 40<br />
Yield loss (% of 4 Inch Depth)<br />
Yield<br />
Sikkema, RC<br />
4
Dual/Sencor PPI + Sencor POST<br />
• Advantages<br />
• Weaknesses<br />
Improvement <strong>in</strong><br />
broadleaf control –<br />
velvetleaf<br />
Reduced chance of<br />
crop <strong>in</strong>jury<br />
No control of<br />
triaz<strong>in</strong>e-resistant resistant<br />
lambsquarters<br />
Requires 4 or 5<br />
applications<br />
Dual (0.7 L/ac) + Sencor (0.2 L/ac) PPI +<br />
Sencor (0.12 L/ac) * 3 POST<br />
Rob<strong>in</strong>son RC<br />
5
<strong>Weed</strong> size at time of micro-rate rate applications<br />
Rob<strong>in</strong>son RC<br />
Comparison of herbicide programs<br />
redroot<br />
pigweed<br />
EB<br />
nightshade<br />
lamb'squarters<br />
velvetleaf<br />
Dual + Sencor; 3<br />
Sencor<br />
Dual + Sencor<br />
Treflan + Dual +<br />
Sencor<br />
0 20 40 60 80 100<br />
Rob<strong>in</strong>son RC<br />
6
Summary<br />
• Excellent control of broadleaf weeds<br />
Dual+Sencor<br />
PPI fb Sencor<br />
• Dual+Sencor <strong>and</strong> Treflan+Sencor provide<br />
less consistent control of the spectrum of<br />
common broadleaf weeds found <strong>in</strong> SW<br />
Ontario.<br />
Common<br />
lambsquarters<br />
Bouchard <strong>and</strong> Neron, 1999<br />
7
Common<br />
ragweed<br />
Bouchard <strong>and</strong> Neron, 1999<br />
Velvetleaf<br />
Bouchard <strong>and</strong> Neron, 1999<br />
8
Redroot<br />
pigweed<br />
Bouchard <strong>and</strong> Neron, 1999<br />
Eastern<br />
black<br />
nightshade<br />
Bouchard <strong>and</strong> Neron, 1999<br />
9
Hairy<br />
nightshade<br />
Bouchard <strong>and</strong> Neron, 1999<br />
Maximum size of hairy nightshade<br />
for Prism control<br />
10
Relative germ<strong>in</strong>ation <strong>in</strong>tervals<br />
• Lambsquarters<br />
• Common ragweed<br />
• Velvetleaf<br />
• Redroot pigweed<br />
• Eastern black nightshade<br />
h • Hairy nightshade<br />
late April to<br />
late June<br />
early May to<br />
June<br />
mid-May to<br />
July<br />
Postemergence broadleaf herbicides<br />
• Sencor<br />
General broadleaf control<br />
• P<strong>in</strong>nacle<br />
Triaz<strong>in</strong>e-tolerant weeds (lambsquarters,<br />
pigweed)<br />
• Prism<br />
Hairy nightshade<br />
11
P<strong>in</strong>nacle<br />
Metribuz<strong>in</strong><br />
Sikkema RC<br />
P<strong>in</strong>nacle <strong>in</strong>jury on tomatoes<br />
Rob<strong>in</strong>son RC<br />
12
Observations on P<strong>in</strong>nacle<br />
• 3.2 g/ac; applied 21 days POST-transplant<br />
• Triaz<strong>in</strong>e-tolerant weeds<br />
• Not registered as tank mix with Sencor<br />
• Injury more likely<br />
If applied when temps >32 o C<br />
<br />
Frost-<strong>in</strong>jured plants<br />
• Varietal sensitivity (eg. N1069, H9909)<br />
P<strong>in</strong>nacle 3.2 g/ac – H9553<br />
Rob<strong>in</strong>son RC<br />
13
P<strong>in</strong>nacle 3.2 g/ac – H9553<br />
Rob<strong>in</strong>son RC<br />
Prism <strong>in</strong>jury on tomatoes<br />
Rob<strong>in</strong>son RC<br />
14
Problem grass weeds <strong>in</strong> tomatoes<br />
<strong>and</strong> peppers<br />
• Large <strong>and</strong> smooth crabgrass<br />
• Foxtails – yellow, giant, green<br />
• Fll<br />
Fall panicum<br />
Smooth<br />
crabgrass<br />
Large<br />
crabgrass<br />
Bouchard <strong>and</strong> Neron, 1999<br />
15
Yellow foxtail<br />
Bouchard <strong>and</strong> Neron, 1999<br />
Giant<br />
Foxtail<br />
Green<br />
foxtail<br />
Bouchard <strong>and</strong> Neron, 1999<br />
16
Fall panicum<br />
Green foxtail vs. Fall panicum<br />
LOOKS VERY SIMILAR TO FALL PANICUM WHEN YOUNG!!!<br />
• Hairs along marg<strong>in</strong>s of<br />
leaf sheath <strong>in</strong> green<br />
foxtail<br />
• Hairs not present <strong>in</strong> fall<br />
panicum<br />
17
Annual Grass <strong>Control</strong><br />
Excel Super<br />
Venture L<br />
Poast Ultra<br />
50 60 70 80 90 100<br />
<strong>Weed</strong> <strong>Control</strong> (% )<br />
Yellow, giant, green foxtail<br />
Barnyardgrass, witchgrass, fall panicum<br />
ECW, 1994-1999<br />
<strong>Control</strong> of annual grasses with Prism<br />
Sikkema RC<br />
18
Annual grass control with Prism<br />
Smooth Crabgrass<br />
Large Crabgrass<br />
Barnyard Grass<br />
Witchgrass<br />
Fall Panicum<br />
Green Foxtail<br />
Yellow Foxtail<br />
0 20 40 60 80 100<br />
% weed control<br />
ECW, 1994-1999<br />
<strong>Weed</strong> <strong>Control</strong> <strong>in</strong> <strong>Peppers</strong><br />
• Treflan – annual grasses, chickweed, PW, LQ<br />
• Devr<strong>in</strong>ol – some broadleaf suppression<br />
• Dual II Magnum – annual grasses, some broadleaf<br />
control (pigweed, EBN, lambsquarters)<br />
19
Dual (0.5 L/ac)<br />
Dual+Devr<strong>in</strong>ol<br />
(0.5 L/ac + 1.8 kg/ac)<br />
O’Sullivan, Simcoe<br />
Dual+Dacthal<br />
untreated<br />
(0.5 L/ac + 6.2 kg/ac) O’Sullivan, Simcoe<br />
20
Chateau – Summary<br />
• <strong>Weed</strong> control<br />
• Broadleaf weeds<br />
• Herbicide <strong>in</strong>corporation<br />
• Injury<br />
• Placement of herbicide<br />
Chateau (56 g/ac) – row middle<br />
Chateau (56 g/ac) – broadcast<br />
21
Spray drift <strong>in</strong>jury <strong>in</strong> vegetables<br />
22
Rob<strong>in</strong>son RC<br />
23
Banvel drift <strong>in</strong> tomatoes<br />
WSSA Website<br />
25
Some resources:<br />
Injury symptoms PPI/PRE:<br />
http://www.omafra.gov.on.ca/english/crops/facts/<strong>in</strong>fo_herbicide2.htm<br />
Injury symptoms POST:<br />
http://www.omafra.gov.on.ca/english/crops/facts/<strong>in</strong>fo_herbicide.htm<br />
Herbicide efficacy:<br />
http://www.omafra.gov.on.ca/english/crops/facts/<strong>in</strong>fo_broadleaf.htm<br />
This presentation:<br />
http://www.ridgetownc.com/research/documents/rob<strong>in</strong>son_IPM_scouti<br />
ng_meet<strong>in</strong>g_april.pdf<br />
Darren Rob<strong>in</strong>son<br />
drob<strong>in</strong>so@ridgetownc.uoguelph.ca<br />
(519) 674-1604<br />
29
Change language