Title: Managing weeds in sweet corn Callisto, varieties, and other concerns
1Managing weeds in sweet corn-Callisto,
varieties, and other concerns-
- Douglas Doohan and Joel Felix
- OSU / OARDC, Wooster
2- Managing weeds with Callisto
- How varieties respond to Callisto
- Carryover issues
3Herbicides for Sweet Corn
- Herbicide resistant grasses weeds
- Few products regt
- OH C. thistle major problem
- No controls
4Herbicides for Sweet Corn
- Callisto
- 22 species PRE
- 31 species POST
- ½ pt atrazine POST 39 species
5Herbicides for Sweet Corn
- Callisto
- 22 species PRE
- 31 species POST
- ½ pt atrazine POST 39 species
- 29 species with Accent
6Herbicides for Sweet Corn
7Herbicides for Sweet Corn
- Callisto
- 6-7.7 oz PRE
- 5-6 oz atrazine
8Herbicides for Sweet Corn
- Callisto
- 6-7.7 oz PRE
- 5-6 oz atrazine
- 3 oz POST
9Herbicides for Sweet Corn
- Callisto
- 6-7.7 oz PRE
- 5-6 oz atrazine
- 3 oz POST
- With / wo atrazine
10Herbicides for Sweet Corn
- Callisto PRE vs POST
- Crop tolerance
- Cost
11Herbicides for Sweet Corn
- Callisto POST
- Adjuvants
- Timing
- Carryover
12Crop Tolerance - Adjuvant Effect
Rate 3 oz/ A
13Callisto crop tolerance - adjuvants
14Effect of Adjuvant
3 oz NIS
3 oz NIS UAN
15Effect of Adjuvant
Rate 3 oz/ A
16Effect of Adjuvant
Untreated
3 oz COC UAN
17Effect of Adjuvant
3 oz NIS
3 oz AMS
18Effect of Adjuvant
3 oz COC UAN
3 oz COC
19Effect of Rate Timing (POST)
Adjuvant Sys. COC 1 UAN 2.5
20Effect of Rate Timing (PRE)
21Callisto variety tolerance 02/03
22Callisto variety tolerance 02/03
23Callisto variety tolerance 02/03
24Callisto variety tolerance 02/03
25Callisto variety tolerance 02/03
26Callisto variety tolerance 03
27Callisto variety tolerance 03
28Permit variety tolerance 03
29Rotational Crop Issues
- Vegetable producers rent much of their land.
- Crop injury from soil residues of agronomic
herbicides is a recurrent problem.
30Callisto carryover effects
31Callisto carryover effects
32Callisto carryover effects
33Callisto carryover effects
34Results Discussion
- No varietal interactions
- Fremont
- Rapid onset of injury
- More severe
- Snap bean and
- cucumber yield effect
- Wooster
- Delayed injury
- Less severe
- No yield effect
35Callisto Carryover Symptoms
Sweetclover Snapbeans
36Callisto Carryover Symptoms
37Clover Response to Callisto Soil Residues
38Snap Bean Response to Callisto Soil Residues
39Cucumber Response to Callisto Soil Residues
40Cabbage Response to Callisto Soil Residues
41Pepper Response to Callisto Soil Residues
42Tomato Response to Callisto Soil Residues
43Summary
- Callisto did not affect yield of rotational crops
at Wooster - Snapbean Very sensitive to Callisto at Fremont
but not at Wooster - Cucumber Yield reduction at Fremont following
Callisto applied at 0.84 kg ai/ha
44Summary
- Cabbage, tomatoes, and bell peppers
- Not harvested at Fremont
- Little injury, no yield effect at Wooster
- Sweet clover
- Extremely sensitive at Fremont, much less so at
Wooster
45Significant site effect ?
- Soils
- Fremont higher OM, CEC and clay
- 2003 Growing Conditions
- Fremont excessive precipitation
- Wooster moderate precipitation
46(No Transcript)
47Effect of Rate Timing
1.5 oz/a COC UAN
Untreated
48Effect of Rate Timing
Untreated
3 oz/a COC UAN
6 oz/a COC UAN
1.5 oz/a COC UAN
49Apple of Peru
- Is apple of Peru the next weed to worry about or
is it just another weed?
50Pepper Field in 2003
51Pepper Field in 2003
52Pepper Field in 2003
53Spray Miss in Soybeans
54AOP plants in Roundup treated area
55Car Foot Survey-plat map-
56- Ohio State
- A compelling place to work
57- Veg Fruit Industy
- Outstanding collaboration