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How to Manage Pests

UC Pest Management Guidelines

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Little mallow, Malva parviflora, seedling.

Eggplant

Herbicide Treatment Table

(Reviewed 4/10, updated 4/10)

In this Guideline: More about weeds in peach:
Herbicide Amount/Acre R.E.I.+ P.H.I.+
(trade name)   (hours) (days)
  Calculate impact of pesticide on air quality
When choosing a pesticide, consider information relating to environmental quality. Not all registered pesticides are listed. Always read label of product being used.
 
PREPLANT
A. METAM SODIUM*
  (Vapam, Sectagon, etc.) Label rates 48 NA
  COMMENTS: For use in sprinkler or furrow-irrigated eggplants. Apply with enough water to penetrate 18–24 inches and treat at least 50% of planting bed width. Blade injection of metam sodium into preformed beds for weed control gives erratic nematode control; apply with irrigation water for best control of nematodes. Follow recommended waiting period on label before setting transplants out.
 
PREFORMED BEDS
A. PARAQUAT* 0.49–1 lb. a.i.  
  (Gramoxone Inteon) 1.96–4 pt 24 0
  WSSA MODE OF ACTION GROUP NUMBER1: 22
  COMMENTS: A nonselective foliar herbicide that controls only emerged plants and has no residual activity. Applied as a band treatment over the crop row or as a broadcast treatment before seeding or transplanting the eggplants or after seeding but before eggplants emerge. Any eggplants that have emerged at the time of application will be killed along with the weeds. Controls annual weeds and provides some suppression of perennials. Poor control of cheeseweed. Apply when weeds are succulent and from 1–6 inches high; larger weeds are more difficult to control. Apply in 20–60 gal water/acre (10 gal by air) with a nonionic surfactant added at the rate of 8–32 oz/100 gal. Use the high surfactant rate with cereals and heavy weed infestations. Late afternoon applications increase activity. Do not apply when weather conditions favor drift.
 
B. GLYPHOSATE 0.47–0.94 lb a.i.    
  (Roundup PowerMax) 0.68–1.36 pt 4 14
  WSSA MODE OF ACTION GROUP NUMBER1: 9
  COMMENTS: A nonselective foliar herbicide that can be used up to 3 days before direct seeding takes place. The rate depends upon the weed species present and to some extent on weed size; control is poor when weeds exceed the maximum size indicated on the label. Cheeseweed and burning nettle require the higher rate, as do perennials. Annual weeds are best controlled when small. Apply in 3–20 gal water. Glyphosate provides good annual weed control and some suppression of perennial weeds. Control of perennials improves with late summer or fall applications during noncrop periods when perennials are actively growing.
 
C. CARFENTRAZONE 0.0296 lb a.i.    
  (Shark) 2 fl oz 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: A nonselective, burndown application that can be used before transplanting eggplants when weeds are less than 4 inches tall or in rosettes less than 3 inches across.
 
D. PELARGONIC ACID
  (Scythe) 3–5% v/v in 75 to 200
gal water/acre		 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 27
  COMMENTS: A nonselective, burndown application that can be used before seeding or transplanting eggplants. The smaller the weeds, the more effective the control.
 
PREPLANT
A. BENSULIDE 4–6 lb a.i.    
  (Prefar) 4EC 4–6 qt 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 8
  COMMENTS: A preplant incorporated herbicide that controls annual grasses, but not wild oats or volunteer cereals, and certain broadleaf weeds such as purslane and pigweed. Apply in 10–50 gal water/acre and incorporate to a depth of 1–3 inches; bensulide can also be applied by chemigation or by surface application followed by sprinkler irrigation for incorporation. This material has a long residual (6 months or more in some soils) and 120-day plantback restriction for nonlabeled crops.
 
B. NAPROPAMIDE 1–2 lb a.i.    
  (Devrinol) 50DF 2–4 lb 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: A preplant incorporated herbicide; the rate of application of this material depends on soil type. Incorporate to a depth of 1–3 inches soon after application to prevent loss. Band applications are frequently used to reduce cost. Controls most annual grasses and broadleaves, but not nightshades, mustards, horseweed, or flaxleaf fleabane. It has a long residual and can cause problems on crops such as lettuce, sugarbeet, and cereals planted in rotation.
 
POSTPLANT
A. SETHOXYDIM 0.28 lb a.i.    
  (Poast) 1.5EC 1.5 pt 12 20
  WSSA MODE OF ACTION GROUP NUMBER1: 1
  COMMENTS: A systemic herbicide that controls most annual and perennial grasses. Apply in 10–20 gal water; add a crop oil concentrate at the rate of 1 qt/acre. Grasses must be at the proper size, well watered, and actively growing for good control. This treatment can be repeated up to 3 times/season with a preharvest interval of 20 days. Read label for restrictions regarding tank mixes.
 
B. NAPROPAMIDE 1–2 lb a.i.    
  (Devrinol) 50DF 2–4 lb 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: Apply the recommended amount of napropamide to the soil surface immediately after transplanting. It may be applied over the top of the plants. Use 20–50 gal spray/acre and make sure that the material reaches the zone of weed seed germination. Use overhead sprinkler irrigation to wet the soil to a depth of 2–4 inches.
 
C. CLETHODIM 0.09093–0.12 lb a.i.    
  (Select Max) 12–16 fl oz 24 20
  WSSA MODE OF ACTION GROUP NUMBER1: 1
  COMMENTS: A systemic herbicide that controls annual and perennial grasses. For ground applications, apply in 10 to 40 gal of spray solution/acre; add a crop oil concentrate at the rate of 1% v/v in the finished spray volume. Grasses must be at the proper size (see label), well watered, and actively growing for good control. Make repeat applications at a minimum interval of 14 days. Do not apply more than 64 fl oz/season.
 
D. HALOSULFURON 0.37–0.75 oz a.i.    
  (Sandea) 0.5–1 oz 12 30
  WSSA MODE OF ACTION GROUP NUMBER1: 2
  COMMENTS: For use on seed and transplant eggplants for the control of nutsedge. Apply as a directed spray or with shields to avoid contact with the crop. Injury may result if the spray contacts the foliage. Use of 0.25 to 0.5% v/v of nonionic surfactant is recommended. Use of crop oil concentrate or silicone surfactants is not recommended due to increased risk of injury. Do not apply halosulfuron if a soil application of an organophosphate insecticide has been made. Do not apply a foliar organophosphate insecticide within 21 days before or 7 days after any halosulfuron treatment. Not for use in Imperial and Riverside counties.
 
E. CARFENTRAZONE 0.0296 lb a.i.    
  (Shark) 2 fl oz 48 0
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: May be applied to the row middles using a hooded sprayer. Take care to keep the spray material off the crop.
 
F. PELARGONIC ACID
  (Scythe) 3–5% v/v in 75 to 200
gal water/acre		 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 27
  COMMENTS: May be applied to the row middles using a hooded sprayer. Take care to keep the spray material off the crop.
 
* Permit required from county agricultural commissioner for purchase or use.
+ Restricted entry interval (R.E.I.) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
1 Group numbers are assigned by the Weed Science Society of America (WSSA) according to different modes of action. Although weeds may exhibit multiple resistance across many groups, mode of action numbers are useful in planning mixtures or rotations of herbicides with different modes of action. For more information, see http://www.hracglobal.com.
NA Not applicable.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Eggplant
UC ANR Publication 3475
Weeds
R. H. Molinar, UC Cooperative Extension Fresno County.

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