2010 NOW Management Considerations

8/9/2019 2010 NOW Management Considerations

1/17

Navel Orangeworm

Control: What toconsider for 2010

David DollCentral San Joaquin Almond Day

UCCE Merced County

6-23-10


2/17

The Many Faces of NOW

Why a problem?

Invasive pest, host density about 10,000 times greater than

original, expansion of acreage closer to native range, almonds

in higher temperature environmentsA True Success Story!

David Doll

Central San Joaquin Almond Day

UCCE Merced County

6-23-10


3/17

NOW Control Requires a few

Considerations

COVERAGE

CONTROL

David Doll


UCCE Merced County

6-23-10


4/17

Strategy: Population Reduction

Population Reduction Strategies:

Tree Mummies

Ground Mummies

Proximity to Pistachios, Figs,Pomegranate

Previous Year Damage

Harvest Date

Peach Twig Borer

Chemicals being used

David Doll


UCCE Merced County

6-23-10


5/17

AVERAGE

# MUMMIES

PER TREE # GROWERS

AVERAGE % NOW

INFESTATION

AT HARVEST

2 (2.6 - 177) 21 3.53 (0.2 - 14)


David Doll


UCCE Merced County

6-23-10


6/17

Variety Survival

Fritz 6.92% A

Nonpareil 10.00% B

Monterey13.00% B

Butte 18.00% C

Padre 32.09% D

Overwintering Flight

David Doll


UCCE Merced County

6-23-10


7/17

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

1100 1300 1500 1700 1900 2100

Adultsper100,0

0

0

Nuts

Adult emergence from mummies

Butte

Padre

July

Degree days Fahrenheit from January 1


David Doll


UCCE Merced County

6-23-10


8/17


0

50

100

150

200

250

300

350

800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200

Madera 2009

Pisachios A

Pistachios B

Pistachios C

Almonds A

Almonds B

Almonds C

Eggs

Degree Days

July 17

David Doll


UCCE Merced County

6-23-10

d ll


9/17

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

Number NOW Infested Nuts/200

Untreated Water Confirm 2F (16 oz) Dimilin 25W (16 oz)

Asana (16 oz) Success (6 oz)) Guthion 50W (4 lb) Brigade (12 oz)

Imidan 70W (4 lb) Pounce 3.2 (16 oz) Intrepid (12 oz) Intrepid (14 oz)

Intrepid (16 oz)

c

a

bc

a

ab

a

ab

a

a

a

a

a a

a

a

Effects of various insecticides (7/2/99)

on NOW infestation (9/15/99)

David Doll


UCCE Merced County

6-23-10

D id D ll


10/17


Pyrethroids (Asana,Pounce),

Organophosphates

(Imidan)

2-5% Hullsplit

Reduce Risk (Dimilin,

Intrepid, Success, Altacor,

Belt, etc.)

Early Side of

Hullsplit/Blank split

All Pesticides:

Coverage of nut

comes into question

Why the difference?

Persistence of Product

David Doll


UCCE Merced County

6-23-10

D id D ll


11/17

Insecticide Eggs Percent Survival Reduction

compared to

Controls

Assail 10 day 200 0.5 98.8%

Assail 14 day 200 1.0 97.6%

Assail 21 day 200 2.0 95.3%

Assail 24 day 600 13.0 69.4%

Assail 34 day 200 16.5 61.1%

Altacor 10 day 200 0 100.0%

Altacor 14 day 200 0 100.0%

Altacor 21 day 200 0 100.0%

Altacor 24 day 200 1.5 96.5%

Altacor 34 day 200 1.0 97.6%

Intrepid 10 day 200 1.0 97.6%

Intrepid 14 day 200 0.5 98.8%

Intrepid 21 day 200 0 100.0%

Intrepid 24 day 400 2.5 94.1%Intrepid 34 day 200 0 100.0%

Persistence of Insecticides

David Doll


UCCE Merced County

6-23-10

David Doll


12/17

Day Reduction N

8 95.3% 200

11 98.8% 600

13 97.6% 200

17 89.3% 20023 90.5% 200

29 91.7% 400

Brigade in Madera County almonds, August 15, 2007

Persistence of Insecticides

David Doll


UCCE Merced County

6-23-10

David Doll


13/17

Spray Rig CoverageCOVERAGE

David Doll


UCCE Merced County

6-23-10

David Doll


14/17

COVERAGE

Spray Rig Coverage

Conclusion: Speed Doesnt Kill!

David Doll


UCCE Merced County

6-23-10

David Doll


15/17

COVERAGE

Effect of Hullsplit on Coverage

As nut splits, surface area increases,

ability to cover decreases.

Surface area of

almond hull

Surface area of

almond hull + 20-25%

from split

Surface area of

almond hull + 50-75%

from split

Implement Bracket Sprays

David Doll


UCCE Merced County

6-23-10

David Doll


16/17

COVERAGE

CONTROL

A properly timed spray withthorough coverage will provide a

50% reduction of NOW damage

at harvest so do I spray more?

Spray Considerations

Winter Sanitation

Neighboring Crops/Insect Pressure

May Spray Population Reduction

Bracket Sprays Early side of hull split / 2 weeks later

Early Harvest

Late Harvesting Varieties

Orchard History

PTB Damage

David Doll


UCCE Merced County

6-23-10

David Doll


17/17

COVERAGE

CONTROL 2010 Season Thoughts:

Cooler Spring/Summer, but 2nd flight should still sync up to

hullsplit

PTB Flight appears to as if it is going to overlap with

hullsplit (Anticipated 2nd flight July 6th-10th)

Consider pressure and history, but 1 spray on the early side

of Hullsplit is recommended - keep in mind your May Spray Using a Pyrethroid will most likely cause a mite flare up so

add a miticide

NOW control should evolve as your orchard practices

change (or our recommendations change)


UCCE Merced County

6-23-10

2010 NOW Management Considerations

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