demonstration and evaluation of integrated crop scouting on pumpkins in southern nj sally walker...
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Demonstration and Evaluation Demonstration and Evaluation of Integrated Crop Scouting of Integrated Crop Scouting on Pumpkins in Southern NJon Pumpkins in Southern NJ
Demonstration and Evaluation Demonstration and Evaluation of Integrated Crop Scouting of Integrated Crop Scouting on Pumpkins in Southern NJon Pumpkins in Southern NJ
Sally WalkerSally Walker
Rutgers Cooperative ExtensionRutgers Cooperative Extension
Vegetable IPM ProgramVegetable IPM Program
Investigators
Joe Ingerson-Mahar Vegetable IPM Coordinator
Kris Holmstrom IPM Program Associate
Michelle Infante-Casella Gloucester County Ag Agent
Ray Samulis Burlington County Ag Agent
Bill Sciarappa Monmouth County Ag Agent
Steve Johnston Specialist in Vegetable Pathology
Frank Spieker Garden State Pest Management
Objectives
• On-farm demonstration• Evaluate jack-o-lantern pumpkins
(powdery mildew susceptible and resistant varieties)
• Test and compare the North Jersey IPM scouting protocol vs. grower’s usual practices
5 farms, 6 comparison blocks/fields(Cumberland, 2-Gloucester, Burlington, Monmouth)
Methods
IPM - pest management based on field scouting information
Control - grower follows normal practices
Evaluate yields and field pest levels
Field Layout
ControlIPM
1.5 acres
1.8 acres
2.5 acres
0.4 acres
2.3 acres
0.5 acres
ControlIPM
4.8 acres
4.5 acres
2.0 acres
2.9 acres
1.8 acres
1.8 acres
Methods• Scout twice a week from emergence
to start of fungicide schedule
• 2 leaves, 5 plants, 10 locations– Insects, mites– Foliar and fruit diseases– Weeds, other problems noted
Scouting Form
Cucumber Beetles
Threshold:>2 per 6 sites
Aphids Spider Mites
Squash Bug
Threshold:>20 leaves w/colony
Threshold:1 nymph group/plant
Threshold: increasing # leaves infested
Powdery Mildew
Threshold:1 lesion/50 mature leaves
Phytophthora
Threshold:Presence of disease
Downy Mildew
Threshold:Presence of disease orDisease forecasted for our region
(Cucurbit Downy Mildew Forecast)
Bacterial Spot
Threshold:Presence of disease
Virus
Watermelon mosaic virus 2Potyvirus
Protocol for IPM fields• Admire at planting or scout for
cuke beetles and treat as needed• Initiate fungicide treatments at
powdery mildew threshold (1 lesion/50 mature leaves) – Bravo+Nova alt. Quadris 7-10 day
schedule
• Modify schedule based on scouting results– Add insecticide if needed– Modify fungicide if needed
Marketable Yield
23.18
16.52
21.64
8.67
25.42
18.8
17.32
7.13
16.23
0 5 10 15 20 25 30
G1 (Merlin)
G1 (AutumnKing)
C (Howden)
M (Howden)
G2 (Howden)
tons per acre
IPM
Control
Average Fruit Weight
10.4
17.7
14.3
13.1
12.3
17.8
16.6
12.5
0 5 10 15 20
G1 (Merlin)
G1 (Autumn King)
C (Howden)
M (Howden)
G2 (Howden)
pounds
IPM
Control
ResultsLocation Variety Plot
# Foliar Fungicides
# Foliar Insecticides
Glouc 1 MerlinControl 8 8
IPM 7 6
Glouc 1Autumn King
Control 8 8
IPM 7 6
BurlMagic Lantern
Control 3 2
IPM 3 2
Glouc 2 HowdenControl 6 3
IPM 6 1
Cumb HowdenControl 6 2
IPM 6 2
Monmouth HowdenControl 4 0
IPM 4 0
Fungicide Reduction
Location Variety Fungicide
Reduction
Compared to Standard Rec
(vine run)
Glouc 1 Merlin 1 3
Glouc 1Autumn King
1 3
BurlMagic Lantern
0 1
Glouc 2 Howden 0 2
Cumb Howden 0 2
Monmouth Howden 0 4
Insecticide Reduction
Location Variety Insecticide
Reduction
Compared to Scouting Results
Glouc 1 Merlin 2 6
Glouc 1Autumn King
2 6
BurlMagic Lantern
0 0
Glouc 2 Howden 1 2
Cumb Howden 0 2
Monmouth Howden 0 0
Bottom Line
Pesticide Costs: Potential Savings:
Fungicides: 1-2 applications each:$17 - Bravo OR = $17-$34
$27 - Bravo+Nova = $27-$54
$31 - Quadris = $31-$62
Insecticides/Miticides: 2 applications:$7-10/acre/appl. = $14-$20
Scouting costs:$25 per acre
Conclusions
• Disease scouting worked well for timing and choice of fungicide
• Potential for pesticide reduction and cost savings:– 1-4 fungicide applications– 2+ insecticide applications
• Overall grower response has been positive
Plant & Pest AdvisoryVegetable Crops EditionPlant & Pest Advisory
Vegetable Crops Edition Stay informed of insect and
disease advisories
Reduce costs through IPM and more effective use of pesticides
New info each week
Available by mail or fax subscription
Visit the Vegetable IPM Program booth for subscription forms
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