Site Preparation

diquat (Reglone)

Nonbearing crop only

Rate 0.375 to 0.5 lb ai/a (1.5 to 2 pint/a of product)

Remarks Add a nonionic surfactant or crop oil concentrate according to label. Weeds 1 inch to 6 inches in height are the easiest to control.

Caution Use a shield or wrap plant when spraying around young trees or vines.

Action in plant Acts as contact; absorbs energy produced during photosynthesis and forms peroxides that disrupt living cells.

Site of action Group 22: photosystem I electron diversion

Chemical family Bipyridilium

glyphosate (several products)

Rate Consult labels.

Time Apply to weeds at least 10 days before planting the crop.

Remarks Use highest rate on field bindweed. Rain within 6 hours after application for any weed species may reduce effectiveness.

Caution Do not apply if weeds are under stress from drought, weather, or maturity.

Action in plant Causes ammonium ions to accumulate, disrupting photosynthesis.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted