Weed Management in Cucurbits

Curcurbits Select Max Sinbar Alanap Sandea Curbit Herbicide/Mulch relations

What’s New - Select Max clethodim – Registered 2006 –Select Max 0.97 EC –Apply twice the rate of Select 2 EC –For Cantaloupe, Cucumber, Squash, and Watermelon use fl oz/A –Label allows for use of NIS instead of COC

Sinbar - Watermelon  2 to 3 oz of product applied preemergence  Seeded: make applications after planting but before the crop emergence  Transplants: Apply prior to transplant on bareground. May apply over mulch but ½ inch rainfall must occur following applications.  Now owned by Tessenderlo Kerley, Inc

Sinbar – watermelon injury and pigweed control Watermelon Injury Pigweed Control

Palmer Amaranth Control 8 WAT

Yellow Nutsedge Control 8 WAT

Watermelon Harvest (Total Weight) 1000 lbs/A

Curbit 1.5 pt/A PRE

Curbit 1.5 pt/A + Sinbar 2.5 oz

Curbit 1.5 pt/A + Sinbar 6 oz

Summary - Watermelon Sinbar at 3 oz/A provided control of: a) Palmer amaranth = 78-89% b) Yellow nutsedge = 26-44% c) Tropic croton = 72-88% Sinbar at 6 oz/A provided control of: a) Palmer amaranth = 95-97% b) Yellow nutsedge = 78-80% c) Tropic croton = 97%

Cantaloupe – Sinbar Mulch and Bareground All plots received Treatments (Sinbar applied pre-transplant) –1) 1 qt/A –2) 1 qt/A + 3 oz/A –3) 1 qt/A + 6 oz/A

Cantalope Injury 5 WAT

Cantaloupe Runner Length 5 WAT

Summary Bareground Production - Not a chance Mulch Production - Sinbar did not injury cantaloupe 5 WAT - Sinbar at 6 oz/A reduced runner length 10%, 5 WAT

Sinbar Carryover There are carryover issues after an application of Sinbar most notably the cole and greens crops. Sinbar –The label states “Do not replant treated areas to any crop within 2 years after last application as injury to the subsequent crop(s) may result.”

Sinbar Watermelon CARRYOVER RESEARCH IN PROGRESS Label is very restrictive; UGA preliminary results: < 10% damage: sweet corn, squash, wheat, oat, rye, snap bean 1X rate 10 to 40% damage: cabbage, kale, broccoli, collard 2X rate: 40 to 80% damage: cabbage, kale, broccoli, collard

Alanap Going Away – Spring 2008  Chemtura voluntarily canceling registration  Production was stopped Oct  50,000 gal inventory  2.5 years of inventory if normal use continues  Shelf life is about 3 years

common ragweedchickweed common cockleburpurslane common lambsquarterswhite mustard pigweedssmartweeds Alanap: Weeds Controlled Production of this herbicide has ceased; 2 yrs of inventory

Non-treated

Curbit Curbit followed by Alanap

Sandea PRE/POST to crop: cucumber and cantaloupe Row middle only: squash PRE and row middle: watermelon

Sandea Labeled for Watermelon 1)PREEMERGENCE: 0.75 oz/A Seeded: Apply after planting, before cracking Transplant bareground/mulch: Do not transplant till 7 d after application. * Avoid heavy rain right after application *DO NOT APPLY OVER MULCH and then transplant.

Nontreated Sandea (0.5 oz/A) Watermelon farm in Crisp County, May Treatment at 1-leaf. Pictures to scale.

Sandea for PRE Weed Control common cocklebur wild radish pigweeds common ragweed common lambsquarters yellow nutsedge - suppression purple nutsedge - suppression 2 to 3 weeks residual weed control

Non-treated Control Sandea (0.5 oz/A) PRE W1-00. Halosulfuron study with Ken Lewis in Cordele.

Sandea PRE No herbicide

Sandea for POST Weed Control 1-3 inch 1-9 inch passionflower cocklebur redroot pigweed ragweed pokeweed velvetleaf yellow and purple nutsedge – heavy infestations may require sequential applications 2 to 3 weeks residual weed control

Curbit 1.Curbit is labeled for many cucurbits, Sonalan is not

Curbit 1.Curbit is labeled, Sonalan is not 2.Do not apply under mulch

Cucumber Injury from Curbit

Over mulch, washed offUnder mulch

Over mulch, washed offUnder mulch

Recommend 1 pt if seeded bareground. If not contacting the crop (row middle or mulch) can go up to 3 pts

Amount of Curbit remaining on plastic mulch. TyTy GA, percent days Grey

Herbicide/Mulch Relations

Amount of paraquat remaining on plastic mulch. TyTy GA, percent days Grey

Amount of glyphosate remaining on plastic mulch. TyTy GA, percent days Grey

Halosulfuron dissipation on mulch 65% 6%

Non-treated Sandea prior to transplant

Aim dissipation from mulch

New Herbicide for Watermelons – 2010? Preplant or PRE application of Reflex SEVERE INJURY IF APPLIED TO EMERGED PLANTS

Percent watermelon injury from Reflex. Bareground System. Reflex pre-transplant applied 16 oz/A.

Percent watermelon injury from Reflex. Mulched System. Reflex applied 16 oz/A over mulch. Half inch irrigation prior to transplant.

Carryover from Reflex applied under mulch. Crops planted 6 months later % injury

Comments or Questions?