Spring to Fall Doug Doohan Horticulture & Crop Science, OSU - - PowerPoint PPT Presentation

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Apr 08, 2023 335 likes •571 views

Weed Management in the Vineyard from Spring to Fall Doug Doohan Horticulture & Crop Science, OSU Doohan.1@osu.edu 330 202 3593 Characteristics of Weeds Diversity & density can be astounding Adaptations enable species to survive

SLIDE 1

Weed Management in the Vineyard from Spring to Fall

Doug Doohan Horticulture & Crop Science, OSU Doohan.1@osu.edu 330 202 3593

SLIDE 2

Characteristics of Weeds

Diversity & density can be astounding
Adaptations enable species to survive
Adapted to co-exist with the crop
Modify behavior to cope with weed control
Germination, emergence and reproduction is

environmentally timed.

Impact on crops almost always underestimated

SLIDE 3

3 things that make or break weed control

site preparation
Right herbicide, applied at the right

time, and at the right rate

Preventing re-infestation

SLIDE 4

SLIDE 5

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SLIDE 7

Uncontrolled Perennials Invade Area Under the Trellis from Sod

SLIDE 8

Site preparation

starts 2 years before planting-

Fallow (sod):
Tillage to break dormancy in

rhizomes/ rootstocks

Glyphosate (+ Stinger) on

regrowth; repeat as needed

Fall-seeded Cover
Roundup Ready Crops: up to 3

applications/ year 60-75 days apart

Seeding of permanent inter-row

covers

SLIDE 9

stage of growth

CT: early bloom or

rosette stage in fall

QG: 4 to 5 leaf stage

to heading

BW: early bloom

1 to 2 qt/A, in 8-12 GPA

fall best
till 4-7 days later

Credit: igrow.org

Site Preparation

2 years before planting-

SLIDE 10

Inter-row Cover Crops

Tall/ hard fescue (can take more

than 1 year to fully establish)

– Late summer/ early fall – 50 - 75 lb/A/ 25 – 50 lb/A – Include a trace of perennial ryegrass – 50 lb N/ A at seeding/ spring

Bed Formation/ Irrigation
In-row

– Perennial rye

SLIDE 11

Weed Control Gallery Roundup Gallery + Surflan

SLIDE 12

Raspberry tolerance to clopyralid – Current Problem

Weed-free zone 18-24” each side of row.

SLIDE 13

Credit: rayshorticulture.blogspot.com

Right herbicide, applied at the right time, and at the right rate

SLIDE 14

Planting Year May June July August September October Grass Select Poast Fusilade Fusilade Poast Select Grass & BL Treflan Surflan Prowl * Surflan Surflan Prowl* BL & Grass Snapshot Venue* Snapshot Venue* Annuals Aim Gramoxone Rely Reglone Aim Gramoxone Rely Reglone Aim Gramoxone Rely Reglone Chateau**** Perennials Roundup Roundup Roundup Roundup Roundup Roundup

* Dormant only, ** Non-bearing only, *** Include surfactant or crop oil, ****Grow tubes & trellised only

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May June July August September December

All of the previous herbicides can be used

Year - 2 Annuals Matrix Matrix Perennials Poast Fusilade Gramoxone Reglone Rely Venue Aim Casoron Year - 3 Annuals Zeus Prime XC & Rely &/ or RU Zeus Prime XC & Rely &/ or RU Annuals Princep & Matrix + RU Princep & Matrix + RU Casoron Annuals Karmex & Matrix + RU Karmex & Matrix + RU Year - 4 Annuals Zeus XC& Rely &/ or RU Zeus XC& Rely &/ or RU Year - 5 Annuals Alion & Rely &/ or RU Casoron

SLIDE 16

Ward & Majek, 2007

SLIDE 17

Herbicides - choice & timing

Poast

– 1-2.5 pt/A

7 day PHI

Select Max

SLIDE 18

Source: Breth & Tee

SLIDE 19

Source: Breth & Tee

SLIDE 20

Tank Mix Combinations

SLIDE 21

Summary

Know Crop/ Herbicide History Before Planting
Begin Eradicating Perennials 12-18 months

before planting

Use PRE Herbicides for “Broad-Spectrum” Weed

Control after Transplanting

Incorporate Other Chemistries in Year 2 and

beyond

Develop and Implement a Clean Up Plan

SLIDE 22

Weed Control in Small Fruit Crops

Funding & Support

Ohio Grape Industry Committee
FMC Corporation
Bayer AgroSciences
OARDC