moving away from chemicals for pest, disease and weed ......the four pest management toolboxes...
TRANSCRIPT
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Moving away from Chemicals for Pest, Disease and Weed
Management
Dr Charles ‘Merf’ Merfield
The BHU Future Farming CentrePermanent Agriculture and Horticulture
Science and Extensionwww.bhu.org.nz/future-farming-centre
The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Physical Chemical
Biological
The four pest management toolboxes
Ecological(Cultural)
Integrated Pest
Management (IPM)
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The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Pest management for last 70 years
Chemical
The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
The future of pest management
EcologicalBiological
Physical
Chemical
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The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Biology and Ecology
Steve and Alison have covered biology and ecology
Now for some physics
Physics
Mesh crop covers - FFC research on mesh for tomato potato psyllid (TPP) control on potatoes
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TPP control
0
50
100
150
200
250
300
350
400
450
500
Control Chemicals Mesh 0.7mm Mesh 0.4mm Mesh 0.3mm
Nu
mb
er
of
TPP
Average total TPP caught on yellow sticky traps
Average total TPP on five leaf sample
a
a
b b b
312.5
403.5
1.0 1.3 0.8
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Yield of > 60 g tubers
60.069.6
78.786.5 85.3
0
10
20
30
40
50
60
70
80
90
100
Control Agrichemicals Mesh 0.7 mm Mesh 0.4 mm Mesh 0.3 mm
Yie
ld t
on
ne
/ h
a
a
b
bc
c c
24% increase from mesh over agrichemicals
Nearly any pest on any crop
Cabbage root fly
Flea beetles
Weevils
Carrot root fly
Shield bugs e.g., GMSB
Caterpillars
Potato tuber moth
Vertebrate pests
Impossible with chemicals
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The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Mesh on perennial crops
Chouinard, G., Firlej, A. & Cormier, D. (2016). Going beyond
sprays and killing agents: Exclusion, sterilization and
disruption for insect pest control in pome and stone fruit
orchards. Scientia Horticulturae, 208, 13-27.
Physical weed control
Physics is the main non-chemical weed toolbox
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The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Electrothermal weeders
Uses high voltage electricity to boil the water inside the plant
Cells explode from the inside
Biochemistry completely destroyed
Catastrophic tissue failure - zero chance of recovery
Thermal effect - impossible to evolve resistance
The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Electrothermal mode of action
True stem
Cotyledon leaves
Hypocotyl
True roots
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The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Electrothermal mode of action
Systemic
mode of
action
The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Electrothermal mode of action
Selective
mode of
action
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Photo Dr Mike Diprose
The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Electrothermal mode of action
Broad acre
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Photo Dr Mike Diprose
Photo Dr Mike Diprose
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Photo Dr Mike Diprose
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The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Light - spectral filters
Many insects and diseases use / need specific wavelengths of light
– Aphids - yellow and UV bands to detect plants and orientate to the sky
– Fungal diseases, e.g., Botrytis cinerea and Alternaria solani need UV light to sporulate
Potatoes grown under UV blocking mesh - very little blight
Control - no mesh - lots of blight
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ECONET 0.15 × 0.35 mm hole mesh No mesh
54 tonne ha - 40 kg / 10 m row 8 tonne ha - 6 kg / 10 m row
TPP, mesh and UV light
When TPP gets under mesh it sulks - mesh blocks UV…..
When we really dial down UV light, psyllid yellows almost stops
What happens when we dial up the UV?
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UV light off UV light on
99.9% of TPP were collected on traps with UV light
14 times more on UV - 1,300% increase
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The BHU Future Farming CentrePermanent Agriculture and Horticulture: Science and Extension
Conclusions
A smorgasbord of physical pest, disease and weed management techniques
The chemical toolbox is loosing tools and very few new ones are being found
The physics, biology and ecology toolboxes are having new tools added at an exponential rate
You need to understand and start using the new tools ASAP.