Time Apply to weeds at least 10 days before planting the crop.
Remarks Use highest rate on field bindweed. Inhibits production of three amino acids and protein synthesis.
Mulches contribute significantly to weed control if constructed and maintained properly. Even without the benefit of weed control, blueberries grow well under mulch because they are shallow rooted and lacking root hairs. A layer of mulch over the soil conserves soil moisture for blueberries. Gooseberries, currants, and elderberries are less likely to benefit directly from mulches compared to blueberries, but given the dearth of herbicides labeled for use in these crops, mulches may be essential to achieve weed control goals.
acetic acid (Weed Pharm Weed and Grass Killer)
Rate 15 to 30 gal/A product (20% acetic acid)
Remarks Apply as a directed application to actively growing, small weeds. Application equipment must be hooded or shielded. Any contact with the crop will cause crop injury. Weed Pharm can be applied up to and including the day of harvest. Approved for organic production.
fluridone (Brake On!)
Rate 0.19 to 0.40 lb ai/A (21 to 43 fl oz/A Brake on!).
Time Fall to spring as a preemergence application.
Remarks If applying less than 32 fl oz/A use preemergence tank-mix partner. PHI 30 days. Requires irrigation for soil incorporation. Application to soil with high organic matter (>3%) may reduce efficacy.
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.
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.
General strategy The type of vine support structure and the method of irrigation influence weed management. Shade from pergolas reduces light available for weed germination and growth. A T-bar trellis may facilitate growth of perennial sods or winter cover crops between the kiwi rows for soil conservation. Drip irrigation reduces weed germination and growth within rows and in aisles. Minimize weed competition and interference within rows. (See "Section L: Orchards and Vineyards" in this handbook.)
carfentrazone (Aim EC)
Raspberry, blackberry, and boysenberry only
Rate 0.03 to 0.1 lb ai/A (2.0 to 6.4 fl oz/A Aim EC); consult labels
Time Apply when primocanes are about 6 inches tall. In alternate-year blackberries, do not apply to new canes during nonbearing year. For broadcast application use up to 2 fl oz/A product.
acetic acid (Weed Pharm Weed and Grass Killer)
Rate 15 to 30 gal product/A
Remarks 20% acetic acid. Apply as a directed application to actively growing small weeds. Application equipment must be hooded or shielded. Any contact with the crop will cause crop injury. Weed Pharm can be applied up to and including the day of harvest. Approved for organic production.
dichlobenil (Casoron 4G)
Rate 4 lb ai/A (100 lb/A Casoron 4G)
Time Apply midwinter, immediately before a cold rain to reduce volatility and enhance weed suppression.
