Transcript Power Point - Primary Industry and Fisheries

DEPARTMENT OF
PRIMARY INDUSTRY AND FISHERIES
Insect Monitoring
www.nt.gov.au
Monitoring
•
Refer to handouts – monitoring procedure and monitoring sheet
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Learn to recognise pests and beneficials
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Start monitoring at the end of the wet season - March/April
•
Serious pests such as mango leafhopper should be controlled before
flowering starts
•
Monitor regularly - at weekly or fortnightly intervals
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Monitor every 2-3 days during the flowering and fruiting period
•
Pests prefer new leaves, flowers and fruit. Concentrate monitoring on
these parts of the tree
DEPARTMENT OF PRIMARY INDUSTRY AND FISHERIES
www.nt.gov.au
Benefits of monitoring
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Become familiar with pest life cyles and level of damage
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Observe effectiveness of beneficials
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Early detection is important for effective control
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Record seasonal trends
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Use information to determine if control is required
DEPARTMENT OF PRIMARY INDUSTRY AND FISHERIES
www.nt.gov.au
Action levels (When is control required?)
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Identify the insect - is it a pest?
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For most pests - control when there is 10% infestation
•
For flower caterpillars control when there are 2 or more per panicle
DEPARTMENT OF PRIMARY INDUSTRY AND FISHERIES
www.nt.gov.au
Action levels
To determine insect action levels survey 10-20 trees per hectare.
Suggested action levels are based on trials as well as information from QDPIF.
Insect
Examine
Action levels and comments
Mango scale
5 terminals
Look for live females and crawlers
Immature females and crawlers are the easiest to
control.
Mature females are difficult to control
Control when susceptible before flowering and harvest
Mango leafhopper
Inspect flowers and young leaves
Control when you see 1 nymph or adult. Monitor and
treat before start of flowering.
Mango tip borer
Terminals
Control if 10% of terminals are infested
Mango planthopper
Terminals and fruit stalks
Control if 10% of terminals are infested
Red banded thrips
Leaves
Control if there are 4 colonies on 6 leaves per tree
Seed weevil
Examine golf ball size fruit for eggs
Control when eggs present if fruit intended for export
If more than 5 blemishes per fruit control hotspots
Flower eating caterpillars
Examine flowers, pull apart
webbing look for live caterpillars
Control when there are more than 2 per flower panicle
Fruit spotting bugs
Examine panicles and small fruit
for bugs and damage
Levels yet to be determined maybe 1-2 bugs per tree
Fruit flies
Monitor with traps and count
numbers
Control when numbers increase
For fruit sent interstate control as per ICA requirements
DEPARTMENT OF PRIMARY INDUSTRY AND FISHERIES
www.nt.gov.au
What do you need for monitoring?
• Note book or monitoring sheets (example in folder)
• Pen
• Secateurs and sealable plastic bags for collecting shoot samples with
pests or diseases
• Plastic specimen tubes
• Hand lens (x10 or x20 magnification)
DEPARTMENT OF PRIMARY INDUSTRY AND FISHERIES
www.nt.gov.au