management of avocado pests in california 28 may 2008...
TRANSCRIPT
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Management of Avocado Pests in
California
28 May 2008
Joseph G. Morse
Professor of Entomology
University of California, Riverside, CA
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• Prior to 1990, insects and mites on avocados in Californiawere under excellent biological control and rarely requiredchemical control
• Recent onslaught of invasive pests
– Persea mite (1990)
– Avocado thrips (1996)
– Diaprepes root weevil discovered in southern Californiain 2005 and is now close to commercial avocadoacreage
– Weevils, seed moth, and armored scales likely to beimported with Mexican fruit first allowed entry toCalifornia 1 February 2007
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Scirtothrips perseae (Thysanoptera: Thripidae)
Avocado Thrips (July 1996)
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Immatureavocadothrips feedingon fruit
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$60 million crop loss due toavocado thrips in 2006
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Context of Chemical Control Research withAvocado Pests
• Worldwide, few examples of good biological control of
pestiferous thrips species (chemical intervention is often
required)
• Scirtothrips citri (California citrus thrips)
• Scirtothrips aurantii (South African citrus thrips)
• Scirtothrips dorsalis (Chili thrips or yellow tea thrips)
Avocado Thrips, Scirtothrips perseae
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• ABAMECTIN - Agri-Mek 0.15 EC
• Abamectin relatively slow in killing avocadothrips
• Quite persistent in leaves, with controlpersisting 6-10 weeks or more (increases thepotential for resistance)
• Also effective in suppressing persea mitepopulations
Standard control method for Avocado thrips:
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Oligonychus perseae (Acari: Tetranychidae)
Persea Mite
Female
Male
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“Nests” of avocado persea mite
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Leaf drop observed with highpersea mite levels
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www.ipm.ucdavis.edu
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Example
Photo ID
Sheet
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Resistance Management on Avocados
FujiMite
Envidor
Zeal
Persea mite
Danitol
Veratran D
Delegate
Agri-Mek
Avocadothrips
21
23
10B
3
Near 3
5
6
IRACclass
Electron transportinhibitor
Ketoenole
Phenetole
Pyrethroid
Plant alkaloids (2)
Spinosyn
Avermectin
Class of chemistry
2012?
2010?
Registration 2009?
Registration 2009?
Registered (Good forrotation)
Registered (Cross resistancepotential to Agri-Mek?)
Registered
Registration status
IRAC = Insecticide Resistance Action Committee (http://www.irac-online.org/)
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Steep Hillsides Are A Formidable ChallengeFor Effective Pesticide Application
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Pesticide Application onCalifornia Avocados
!More than 90% of avocados are on steep hillsides
with a drive row every 4 rows
!Most sprays are applied by helicopter (468-936 l/ha)
!$ 124 - 247 per ha just for application costs
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Hand Spraying With Drag Hoses
! Ca. $2500 for a small spray tank and drag hose pulled
behind a truck or ATV (all terrain vehicle) on drive rows
!91 m or longer drag hose
!570 liter or larger tank
!Treatment at 2800-4675 liters per ha
!Benefits -- excellent coverage and timing possible;
possibility of spot treatments
!Problems -- labor can be expensive and treatment difficult
on steep hillsides
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Another option for pesticide application-- trunk injection (research in progress)
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The Trunk Injection Process (ArborJet, Inc.)
Drill throughto the xylem
Tap in anArborplug® (#useddepends ontrunk diam.)
Inject ameasureddose ofinsecticide
Injectioncomplete
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ResidueAnalysis ByELISA
ToxicityAssessed ByBioassay
LeavesSampled FromTreated Trees
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Trunk Injections
• Acephate and Dinotefuran uptake was very rapidcompared with imidacloprid
• Imidacloprid mobilization within the xylem wasmost active when the Spring flush occurred
• Insufficient data at present to determine howeffective treatments will be against avocado thrips
Preliminary Conclusions (Research in Progress)
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Mexican fruit first allowed entry inCalifornia 1 February 2007
Interceptions of armored scales
(Diaspididae) on Mexican Hass
avocados entering California
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Armored Scales Entering CA from Mexico
• Sampled 1 carton per truck from 102 trucks that entered CAover 20 Sept 2007 - 1 Jan 2008
• Seven species of scale found, 6 not present in California
• Most common scale was Abgrallaspis n. sp.
• Abgrallaspis sp. found (live + dead) in 89 of 102 cartons(87%)
• Live Abgrallaspis sp. eggs or crawlers found in 42 cartons(41%)
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Management of Pests on California Citrus
28 May 2008
Joseph G. Morse
Professor of Entomology
University of California, Riverside
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Citrus Growing
Regions in California
Ca. 70% of
current citrus
acreage is in the
San Joaquin
Valley
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California Citrus Pest Management
"Pest problems vary a good deal by growing region
"Fruit are grown for the fresh fruit market (juice isnot profitable in California) so cosmetic standardsare high
"Most packinghouses now use high-pressurewashers to remove scales and sooty mold fromfruit
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California Citrus Pest Management
San Joaquin Valley - 70% of the state’s citrus
1. Monitor for Citrus Thrips in spring with treatments applied as needed
Delegate (spinetoram) is replacing Success (spinosad) - more effective and
persistent but same class of chemistry (resistance concerns)
2. Red Scale controlled in alternate years with Esteem (pryiproxyfen)
Esteem is very effective but cottony cushion scale outbreaks were seen
during the first 2 years of use (sterilization of vedalia beetle)
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Citrus Thrips, Scirtothrips citri
(Thysanoptera: Thripidae)
– Native to southwestern U.S. and northwestern
Mexico - Citrus is the exotic species
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Thrips scarring of fruit
Wingless thrips nymphs
Winged, adult citrus thrips
Wingless, 1st and 2nd instar thrips Predatory mite feeding on a thrips
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California red scale,Aonidiella aurantti
(Diaspididae)
Resistance toorganophosphates andcarbamates appeared inthe 1990’s
Biological control programintroduced in 1992
14 releases, 1 every 2weeks over 15 Feb - 15Sept (247,100 total per haper year; cost of $222/ha)
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California Red Scale
Pheromone trapfor monitoring
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Adult male scale
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Male scale inseminating a third
instar female
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Aphytis female penetrating the grey skirt
of a young female to deposit an egg
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Aphytis melinus are sold in plastic cups with honey on the lid
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Release wasps by tapping cup at every 6th tree in every 6th row
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Aphytis egg on 3rd instar scale body
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Aphytis melinus larva feeding on anearly third instar red scale
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Scale cover and Aphytis remains
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Early in the evolution
of resistance
A B
Concentration
Pro
port
ion o
f popula
tion
Resistant individualsResistant individuals
at low numbersat low numbers
Fitness of resistantFitness of resistant
individuals is importantindividuals is important
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SeleçãoSeleção
Concentration
A BPro
port
ion o
f popula
tion
Selection(= pesticides sprays)
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Concentration
A B
Distribution
after
resistance has
evolved
Pro
port
ion o
f popula
tion
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California red scale uses esterase enzymes
to resist organophosphates and carbamates.
Esterase enzyme activity correlates with
resistance.
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Fresno
Visalia
Sanger
Orosi
Lindcove
Lindsay
Strathmore
Porterville
Richgrove
Edison
Bakersfield
Tulare
Delano
Hanford
Orange CoveHwy 99
Hwy 5
Hwy 65
High Resistance
Low Resistance
Susceptible
Kern Co.
Tulare Co.
Fresno Co.
Populations of
California Red
Scale
Resistant to
Organophosphate
Insecticides
(1993-1997)
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California Citrus Pest Management
New pest species could severely upset pest managementpractices
Diaprepes root weevil - unclear if soil temperature will be toohigh in interior regions allowing it to become a seriousproblem
Asian citrus psyllid - serious vector of HLB (yellow shootdisease) and present in the nearby Sonora region of Mexico
8-18 sprays per year being used by Florida citrus growers toreduce psyllid populations
Not clear if citrus production in Florida will survive - levels ofHuanglongbing (HLB) appear to be increasing
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Sources of Information -- California Citrus Arthropod Pest Management
• Integrated Pest Management for Citrus (3rd Ed., late 2008) Univ. of Calif. (UC)
DANR Publication # 3303 (www.ipm.ucdavis.edu)
• UC Pest Management Guidelines on the web
– www.ipm.ucdavis.edu - select “Pest Management Guidelines”, “Citrus”,
and the pest of interest
– Basic biology, monitoring methods, treatment thresholds, UC
recommended treatments, precautions in using pesticides (bees,
selectivity)
• Other UC IPM Publications
– IPM in Practice: Principles and Methods of Integrated Pest Management
– Managing Insects and Mites with Spray Oils, Publication # 3418