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Aminopyralid soil residues affect rotational vegetable crops in Florida
Brandon J Fast1, Jason A Ferrell, Gregory E MacDonald
1Dow AgroSciences, 9330 Zionsville Rd, Indianapolis, IN 46268, USA. BJFast@dow.com
Pest Management Science
|March 18, 2011
Summary
Aminopyralid herbicide residues in soil can injure sensitive vegetable crops, even at low concentrations. A field bioassay is recommended to assess carryover risk before planting crops like tomatoes and peppers after bahiagrass pasture use.
Area of Science:
- Agronomy
- Soil Science
- Plant Science
Background:
- Bahiagrass (Paspalum notatum Flueggé) is a poor host for soilborne pests, making it suitable for rotation with vegetable crops in Florida.
- Aminopyralid herbicide enhances bahiagrass production but poses a risk of carryover injury to subsequent sensitive vegetable crops due to its soil residual activity.
Purpose of the Study:
- To evaluate the sensitivity of five common vegetable crops to soil residues of the herbicide aminopyralid.
- To determine the potential for aminopyralid carryover injury in vegetable crops following bahiagrass pasture use.
Main Methods:
- Field research was conducted to assess the impact of varying aminopyralid soil concentrations on vegetable crops.
- Crop injury ratings and fruit yield losses were measured at an aminopyralid soil concentration of 0.2 µg kg⁻¹.
Main Results:
- Significant crop injury and yield loss were observed in bell pepper (48% injury, 61% yield loss), eggplant (67% injury, 64% yield loss), and tomato (71% injury, 95% yield loss) at 0.2 µg kg⁻¹ aminopyralid.
- Muskmelon and watermelon showed minimal injury (3%) and yield loss (8% and 14%, respectively) at the same concentration.
Conclusions:
- Vegetable crops are negatively affected by aminopyralid at soil concentrations below 0.2 µg kg⁻¹.
- A field bioassay is essential to predict and prevent aminopyralid carryover injury in sensitive vegetable crops.
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