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1 Managing Ventenata
2 Why aren t they happy to see me? Hi, My name is Tim
3 Ventenata dubia
4 How to Identify Ventenata: Early Stages (May June) Dark red/black nodes
5 How to Identify Ventenata: Early Stages (May June) Ligule is unusually long (1 8 mm)
6 How to Identify Ventenata: Early Stages (May June) Roots are shallow If seedling is young, seed is often still attached
7 European range: From Spain
8 European range: to Caspian Sea
9 European Neighbors Cheatgrass Medusahead Windgrass
10 Often starts in a depression or along roads
11 No diseases which helps make ventenata competitive High in silica, discourages feeding by insects and mammals Why is ventenata a problem?
12 Movement
13 USDA, NRCS Washington State Office and Pullman Plant Materials Center May 1, 2012
14 Idaho Neighbors Cheatgrass Medusahead Windgrass Canyon grasslands Sagebrush grasslands
15 Important Confusing Graphs
16 Important Confusing Graphs
17 Why is Ventenata Dominating? Litter protects seedlings 65% of seedlings die without litter during winter Nearly all seedlings survive if there is litter
18 Emergence
19 Biomass
20 Why is Ventenata Dominating? Seedlings below litter have narrower roots, potentially increasing ability to find phosphorus
21 Litter narrows root diameter
22 Range and Pasture
23 Pasture Manual omm/pdf/pnw/pnw0614.pdf
24 Estimate height where 90% of grass is below that height Grass 75% to 90% 90% Bromes 250* 350 Tall Fescue Orchardgrass Wheatgrass Ryegrass *Pounds /acre per inch
25 Range and Pasture Grass Start Stop Season Regrowth Bromes 8 4 Sp - F Good Tall Fescue 6 4 Sp,F Good Orchardgrass 8 4 Sp - F Good Wheatgrass 8 4 Sp - F Good Ryegrass 8 to 10 3 Sp, Su Good Example: Brome is 80% canopy and 9 inches tall. Estimated amount available is (9-4)*(250)= 1,250 lbs/ac
26 High ventenata vs. Low ventenata CRP Transition to results slide, discuss importance of site selection, high vs low. High ventenata >50% Low ventenata <25% Treatments Treatments
27 Techniques farmers/ranchers are considering Spray an herbicide along with livestock rotation when 50% of forage has been eaten Spray an herbicide and fertilize for Ventenata control and to make grasses more competitive Rotate cattle to a different pasture when 50% of the forage has been removed Burn in spring to control Ventenata Burn in fall to control Ventenata 0% 20% 40% 60% 80% 100% Considered Adopted
28 Low Ventenata Fall Burn High Ventenata Fall Burn Low Ventenata Spring Burn High Ventenata Spring Burn
29 Control Spring Burn and Spray Fall Burn Only Fall Burn and Spray
30 CRP High Infestation Ventenata Biomass Mow and Remove Only Rotary Mow Only Fertilize Only Control (83.9 kg/ha) Spring Burn Only* Fall Burn Only* Spray Only* Fertilize and Spray* Rotary Mow and Spray* Fall Burn and Spray* Mow Remove and Spray* Spring Burn and Spray* * Treatment significantly different from control Percent Change (%)
31 CRP Low Infestation Ventenata Biomass Fertilize Only* Mow and Remove Only Rotary Mow Only Spring Burn Only Control (29.1 kg/ha) Rotary Mow and Spray Spring Burn and Spray Fall Burn Only Fertilize and Spray Mow Remove and Spray Spray Only* Fall Burn and Spray* * Treatment significantly different from control Percent Change (%)
32 Herbicides Registered System Outrider Plateau Matrix Landmark Axiom Pasture X X Range X X X Rights of Way X X X X Hay X X
33 Herbicide Use Herbicide Rate Timing Remarks Outrider 1 oz/acre Postemergence Kills meadow foxtail Injures bromes in high clay Wait 30 days to graze Plateau/Panoramic 6 oz/acre Postemergence Litter decreases effectivenss Matrix 3 oz/acre Pre and postemergence LandMark 1-2 oz/acre Pre and postemergence No grazing No grazing for 1 year More than 1 year control
34 Questions
35 Hay Production
36 Why is Ventenata a Problem in Timothy Hay? Reduces hay production Shortens stand life Inhibits swathing of hay Excluded from overseas contracts For Northern Idaho and Eastern Washington the loss is $22,000,000 each year
37 Fertilizer and Herbicide Application Nitrogen Phosphorous Potassium Applied in November Axiom 8 oz/a Fertilizer Analysis applied Nitrogen Phosphorous 0 4 to Potassium
38 Timothy Hay Production Practices Forage handbook was used to guide harvest and fertilization Excellent resource for hay production
39 Background on Timothy Production Corms are produced in fall Carbohydrates in stems after harvest are used for corms 4 INCH CUT HEIGHT Root regrowth begins in fall K and P should be applied in fall N applied in spring
40 Treatments Cut height 2 or 4 inches Herbicide Axiom at 0 or oz/a Fertilizer (fall P and K; spring N; no fertilizer)
41 Harvest
42 Fertilizer and Spray at 4 inch Height
43 Not Sprayed/Sprayed at High Ventenata
44 Cut Height and Yield Yield (lb/a) Low Cut and Fertilize and Spray High Cut and Fertilize and Spray High Cut and Fertilize Low Cut and Fertilize High Cut and Spray High Cut Control Low Cut and Spray Low Cut Control
45 Hay Production Hay is cut at 2 inches with 2,000 lbs of hay but when hay is cut at 4 inches, production is 2,500 lbs. Shouldn t I get more hay if I cut more of it? Explanation: Stems for next year come from corms Corms produced each year Energy in stems produces corms More energy = more corms = more stems = more forage
46 Ventenata Biomass For High Ventenata Cover Yield (lb/a) Low Cut and Fertilize and Spray High Cut and Spray Low Cut and Spray High Cut and Fertilize and Spray High Cut and Fertilize Low Cut and Fertilize High Cut Control Low Cut Control
47 Herbicides Registered System Outrider Plateau Matrix Landmark Axiom Pasture X X Range X X X Rights of Way X X X X Hay X X
48 Herbicide Use in Hay Herbicide Rate Timing Remarks Outrider 1 oz/acre Postemergence Kills meadow foxtail Wait 30 days to hay Axiom 8-10 oz/acre Pre and postemergence Wait 30 days to hay Don t graze Minimum 3.5 inch cut height
49 Farmer Interest in Ventenata Management Apply an effective herbicide when one is registered Apply potassium and phosphorous in the fall and nitrogen in the spring to make timothy more competitive Harvest timothy hay at 4 inch height to make timothy more competitive Considered 0% 20% 40% 60% 80% 100% Adopted
50 Keep cut height at 4 inches Axiom applied in fall either pre or post emergent Fertilization Fall for P and K Spring for N Ventenata control allows for overseas markets Hay Summary
51 Questions
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