Terril Marais · 2018. 6. 15. · efficiency of pest control programs and to a large ......
Transcript of Terril Marais · 2018. 6. 15. · efficiency of pest control programs and to a large ......
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Terril Marais www.biologicalservices.com.au
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Integrated pest management can be defined as:
“A philosophy/strategy of pest control that integrates all available tactics to reduce pest populations to an acceptable level in a cost-effective, environmentally rational manner”
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Cultural Controls Crop hygiene
Removal of blown flowers
Removal of unsold stock
Selective pruning of infested plant material
Weed control Persistent weeds serve as refuges for pest populations
Some weeds can also host some plant viruses
Cultivar resistances/susceptibility
Environmental controls Avoid overwatering practices
Eliminate damp areas or patches of standing water
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Physical controls Screening
Quarantine New plant material into the nursery
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Biological controls
Parasitic wasps
Predatory mites
Predatory beetles/flies
Biological sprays
Predatory/parasitic nematodes
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Chemical controls
Selective, targeted sprays
Resistance management strategies
Biorational products
Systemic acquired resistance
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IPM is not a quick fix
It is not implemented overnight
IPM is not rigid
It may differ for every property
No one solution fits all
Every property, crop, grower is different with regards pest pressure, problems, inputs required, environment, costs, management practices and so each program is unique
IPM does not exclude chemicals
IPM does not mean total eradication of pests
IPM means becoming proactive instead of reactive.
IPM is not necessarily a cheap option – but it does not have to mean “I Pay More”
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Which are my major pests?
Are there appropriate “soft” chemicals available?
Are there appropriate biological controls available?
Can they be controlled any other way?
Who are my markets?
Local market, cut flower, foliage, direct to public, interstate/international?
What level of plant damage can be tolerated?
Who are my neighbours?
What do they produce?
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What has been used to control pests in the past? Previous heavy chemical usage may have resulted in
harmful residues on structures and on floors/flooring materials (especially if growing indoors) (On a new property)
Which varieties are targeted by which pests?
What time of year do which pests cause most problems?
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3 Key phases:
1) Get started and familiarise yourself with pest and disease monitoring
Be able to recognise all stages of pest and disease cycles
2) Incorporate biological control into the program using compatible sprays if/when required
Focus on your major pests first
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Monitoring programs can be as simple or as complex as you want, but must be able to provide meaningful data.
Monitoring allows “hotspots” to be identified before they become wide spread.
Monitoring can directly impact the speed and efficiency of pest control programs and to a large extent – their cost.
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Monitoring of pest populations
Sticky cards
Crop inspections
Indicator plants
Historical data – use the past as a guide to the future
What/when/where
Understand and recognize all stages of pests/diseases
biology
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Which pests are present Physical location
Plant variety
Life stages present
Which (if any) beneficials are present? Both introduced and naturally occurring
Any signs of disease?
Any problem with irrigation? Plant stress may cause some plants to become more
attractive/susceptible to some pests
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By having staff trained to be able to identify key pests/problems, you straight away increase your chances of identifying potential hotspots before they become major problems.
A little knowledge can go a long way
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Monitoring: traps
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What should be done whether choosing to start a program or not: Remove all weeds and unnecessary plants from the
property, to a distance of 10m from the nearest plant Removes weed and virus refuges
Where possible, group together varieties of plants that have similar pest problems, ie. those that are more prone to whitefly, or aphids, or mites Keeps pests more localised
Enables more accurate and effective placement of beneficials or of spray treatments – greater ability to “spot” treat areas
Can be used as indicator plants for pests
Check and calibrate all spray equipment Replace worn nozzles
Ensure the correct nozzles are being used
Ensures correct and accurate coverage of chemical applications
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Start with a preventative program, targeting the major pests encountered Preventative programs help maintain lower pest levels
Natural predator/parasite populations tend to build up after pest populations have already reached high numbers
Can reduce overall costs by reducing the chances of major pest “explosions”
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Important initially to keep close contact with your consultant Can provide advice on pest/beneficial identification
May be able to provide monitoring service - depending on location
May be able to offer staff training – depending on location
Can provide advice regarding compatible sprays
not harmful to beneficials
effective against disease
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More than 4000 species worldwide Females give birth to live females which may already have developing
young in them when they are born
Each female produces 50-200 young which can begin reproducing in 6-10 days depending on temperatures
When populations become very high, they start producing winged offspring
Damage Direct – due to toxins in saliva causing plant distortion
Indirect – vector viruses
Cosmetic – honey dew, (resulting in sooty moulds) and shed skins
Identification – best carried out by experts Need to look at head profile between antennae and “butt” shape
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Potato aphid
Foxglove aphid
Green peach aphid
Cotton aphid
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Melon aphid - Aphis gossypii
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Foxglove aphid -Aulacorthum solani
Potato aphid - Macrosiphum euphorbiae
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Green peach aphid - Myzus persicae
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Aphid controls supplied by Biological Services: Aphidius colemani – Controls a wide range of aphids
including green peach aphid and melon aphids
Aphidius ervi – Controls potato aphid and greenhouse potato aphid
Aphelinus abdominalis - Controls green peach aphid, potato aphid and greenhouse potato aphid
Aphid parasite mix – a combination of the 3 parasites listed
above to control a range of aphid species.
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Aphelinus abdominalis
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Aphidius colemani
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Aphid mummies found in AP mix
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Only a few thrips species cause serious problems Western flower thrips (WFT)
Attacks over 200 different plant species
Damage can be direct via feeding
Feed on pollen
Indirect – vectors of Impatiens Necrotic Spot Virus (INSV) and Tomato Spotted Wilt Virus (TSWV)
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Western flower thrips (WFT)
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Greenhouse thrips – Heliothrips haemorrhoidalis Large black thrips – less attractive to predatory mites due to
size and defence mechanism
Wide host range including Vireyas, citrus, avocado and rhododendron
Causes silvering on leaves
Black faecal spots on underside of leaves and/or on flowers
Monitor with yellow or blue sticky traps
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Greenhouse thrips
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Thrips controls supplied by Biological Services:
Hypo-A - Hypoaspis aculiefer. Applied to media at seeding/planting
Cucumeris - Neoseiulus cucumeris. Applied to media or over plants
Orius - Orius tantillus. Must be used in conjunction with banker plants
Hypo-A Cucumeris Orius
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Basil bankers for Orius
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Attack a wide range of plants
Deposit honey dew on upper surfaces of lower leaves
Black sooty moulds grow on the honey dew
Some species can transmit plant viruses
Most life stages are not affected by non systemic chemicals due to a protective covering , ie. eggs, larvae, pupae
Whitefly
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2 main species Greenhouse whitefly – Trialeurodes vaporariorum
Females lay up to 400 eggs in a lifetime on preferred hosts
Wings held “tent like” over the body
Abdomen not clearly visible between wings
Adults more concentrated in the heads of plants
Silverleaf whitefly – Bemisia tabaci
Adults slightly smaller than greenhouse whitefly
Wings held slightly parallel to each other
Adults well distributed over the plant
Highly resistant to chemicals
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Silverleaf whitefly Greenhouse whitefly
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Whitefly controls supplied by Biological Services: Encarsia formosa – parasitic wasp
Supplied as pupae stuck to cardboard tags (100 pupae/tag)
Need temps over 18°C to fly
Must be introduced when whitefly levels are very low
Most effective against greenhouse whitefly
Eretmocerus hayati – parasitic wasp Supplied as pupae in vials of 1000
More effective against silverleaf whitefly than Encarsia
Nesiocoris tenuis – predatory bug Supplied as juveniles and adults on contract only per square metre
Only suitable for tomatoes and eggplants
Can cause some damage if numbers build too high (can be controlled with natural Pyrethrum)
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Eretmocerus adult and whitefly scale
Greenhouse whitefly -
unparasitized and parasitized pupae
Encarsia adult
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Nesidiocoris nymph, and adults
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Nesidiocoris damage symptoms
Feeding rings
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Fungus Gnats (Sciarid flies) Direct damage if larvae numbers are high – chew on root
tips, or young leaves touching soil/media
Indirect damage by providing entry points for plant fungal pathogens
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Shore flies Live in the soil/growing media
Feed on dead and decaying material
Pupae are easily found on flooring plastic around puddles of standing water
Fungus gnat Shore fly
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Fungus gnat and shore fly controls available from Biological Services: Hypo M – Hypoaspis miles and Hypo A – Hypoaspis
aculeifer Controls fungus gnat larvae
Soil dwelling mites
Sprinkled over new potting material when seeding/propagating plant material
Generalist feeder
Compatible with predatory nematodes
Dalotia – Dalotia coriaria Also known as rove beetles or devil’s coachmen
Soil dwelling beetle
Controls shore flies
Generalist feeder
Likes moist conditions – good for areas around standing water
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Dalotia adult
Dalotia juvenile
Hypo M
Hypo A
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Piercing/sucking pests
Attack a wide range of plants
Overwinter in wooden structures/shelter belts
Like hot dry conditions
Short lifecycle so hard to kill with sprays
Easily spread by humans, wind and animals
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Main pest species: Two spotted mite – Tetranychus urticae
Broad mite/cyclamen mite – Polyphagotarsonemus latus
Russet mite – various
Scarring on fruit/leaves
Bulb mite – Rhyzoglyphus echinops
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Mite controls available from Biological Services Persimilis – Phytoseiulus persimilis
Predatory mite
Short lifecycle
Prefers warm humid conditions
Works well inside and outside
Sprinkled over plants
Californicus – Neoseiulus californicus Predatory mite
Resistant to many chemicals
Works well in hot dry conditions
Sprinkled over plants
Occidentalis – Typhlodromus occidentalis (on leaf) Predatory mite
Likes hot dry conditions
Supplied on leaf material – high numbers of all stages of predators
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Persimilis
Californicus
Occidentalis
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Sucking insect Mainly attacks citrus, but also found on passionfruit, olives,
walnuts, roses and ivy Will attack all plant parts, but more prevalent on fruit Heavy infestations may cause discolouration, leaf drop and
shoot distortion, which can lead to bark splitting, twig dieback and even tree death
Adults produce 150 + eggs When first hatched, crawlers have 6 legs and will move to find
a suitable place to settle Once settled, waxy filaments are produced to protect the
developing scale, and the juvenile starts feeding
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Adult red scale
Male and female red scale
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Red scale controls supplied by Biological Services Aphytis melinus
Tiny yellow wasp Prefers healthy well –foliaged trees which can provide
shelter from extremes of heat and low humidity Dust is harmful, so less likely to be effective in dusty
areas such as along roadways. Irrigation can be used to help minimise dust and increase humidity
Citrus up to 5 years of age are usually poor candidates for biological control as they offer little natural shelter
Supplied in paper cups containing 10,000 wasps distributed over 9 pieces of shredded paper
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Difficult to assess level of parasitism due to size
Windbreaks and overhead irrigation are effective means of helping Aphytis to establish
Cover crops between rows help to increase humidity within the orchard and supply supplemental nectar for the parasites
Ants can interfere with parasites and reduce their performance
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Adult Aphytis melinus
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Chewing pests
Diamondback moth Attacks most brassicas including: Cabbage
Broccoli
Kale
Radish
Canola
More prevalent in dryer seasons
May completely defoliate plants
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DBM grubs feeding DBM adult
Defoliated Chinese cabbage
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DBM controls supplied by Biological Supplies Ltd Diadegma - Diadegma semiclausum
Parasitic wasp
Deposits eggs into 1st instar grubs (first signs of mining on leaves
Wasps capable of covering a large search area
Supplied as pupae attached to paper squares
Need to be released prior to main moth infestations - just after planting
Can be released into surrounding areas prior to planting
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Diadegma female Diadegma pupae on cards
Diadegma release point
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Further information:
www.biologicalservices.com.au
www.goodbugs.org.au