Transcript 2001 Pumpkin IPM Demonstration

Demonstration and Evaluation
of Integrated Crop Scouting
on Pumpkins in Southern NJ
Sally Walker
Rutgers Cooperative Extension
Vegetable 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
Methods
5 farms, 6 comparison blocks/fields
(Cumberland, 2-Gloucester, Burlington, Monmouth)
IPM - pest
management
based on field
scouting
information
Control - grower
follows normal
practices
Evaluate yields and field pest levels
Field Layout
1.5
acres
Control
IPM
0.4
acres
2.3
acres
1.8
acres
2.5
acres
0.5
acres
Control
IPM
4.8
acres
4.5
acres
2.9
acres
1.8
acres
1.8
acres
2.0
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
Threshold:
>20 leaves w/colony
Squash Bug
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
or
Disease forecasted for our region
(Cucurbit Downy Mildew Forecast)
Bacterial Spot
Threshold:
Presence of disease
Virus
Watermelon mosaic virus 2
Potyvirus
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
IPM
16.23
G2 (Howden)
Control
7.13
8.67
M (Howden)
17.32
C (Howden)
21.64
G1 (Autumn
King)
18.8
16.52
25.42
23.18
G1 (Merlin)
0
5
10
15
tons per acre
20
25
30
Average Fruit Weight
IPM
Control
G2 (Howden)
12.5
13.1
M (Howden)
16.6
C (Howden)
14.3
17.8
17.7
G1 (Autumn King)
12.3
G1 (Merlin)
10.4
0
5
10
pounds
15
20
Results
Location
Variety
# Foliar
Fungicides
# Foliar
Insecticides
Control
8
8
IPM
7
6
Plot
Glouc 1
Merlin
Glouc 1
Autumn
King
Control
8
8
IPM
7
6
Burl
Magic
Lantern
Control
3
2
IPM
3
2
Glouc 2
Howden
Control
6
3
IPM
6
1
Control
6
2
IPM
6
2
Control
4
0
IPM
4
0
Cumb
Howden
Monmouth Howden
Fungicide Reduction
Compared to
Standard Rec
(vine run)
Location
Variety
Fungicide
Reduction
Glouc 1
Merlin
1
3
Glouc 1
Autumn
King
1
3
Burl
Magic
Lantern
0
1
Glouc 2
Howden
0
2
Cumb
Howden
0
2
Monmouth
Howden
0
4
Insecticide Reduction
Compared to
Scouting
Results
Location
Variety
Insecticide
Reduction
Glouc 1
Merlin
2
6
Glouc 1
Autumn
King
2
6
Burl
Magic
Lantern
0
0
Glouc 2
Howden
1
2
Cumb
Howden
0
2
Monmouth
Howden
0
0
Bottom Line
Scouting costs:
$25 per acre
Pesticide Costs:
Fungicides:
Potential Savings:
1-2 applications each:
$17 - Bravo OR
$27 - Bravo+Nova
$31 - Quadris
= $17-$34
= $27-$54
= $31-$62
Insecticides/Miticides:
2 applications:
$7-10/acre/appl.
= $14-$20
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
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