control of larvae of the western corn rootworm /wcr/ (diabrotica virgifera virgifera leconte, 1868)...
TRANSCRIPT
Control of larvae of the western corn rootworm /WCR/
(Diabrotica virgifera virgifera LeConte, 1868)
József, TAKÁCS –Miklós, NÁDASY – Péter, BALOGH
University of Veszprém, Georgikon Faculty of Agriculture, Institute of Plant Protection, Department of Agricultural
Entomology
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Female adult
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Damages on leaves and tassels
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Damages on silk and ears
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Larvae of WCR
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Root damage and plant lodging
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Life cycle of WCR
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Biology of the pest Diabrotica
• Overwinter in egg state (about 8 to 10 months in soil)
• Prolonged hatching of eggs (longer than a month)
• Three larval instars (Root damages under a two month period)
• Oviposition from July to October
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• Continuous hatching of eggs• Problems of soil insecticides:
High doses, risk of soil pollution Expensive
Period of effectiveness• Problems of seed coating:
Period of effectiveness(less than a month)
• Need longer effectiveness period• No need soil pollution
Problems of WCR
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MAVICELL pearl
• Microporous build• Able to bind over triple dose of insecticide
agents• Prolonged transmittance of the agents even
under two months• 100 % cellulose• Disorganize under three months in soil
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Porous body of
MAVICELL pearl
Large absorptive surface to bind chemical and biological agents
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Test object:
Tanymecus dilaticollis GILLENHAL
Greenhouse screening
Mortality: Over 95 % even after the 60th day.
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Seeding machines: - Kuhn Planter Junior - Monosem NG Pus - JohnDeere Maxemerge
Plough land applications
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Problems of sowers
• Monosem: Its micro-granule adaptor not able to sow the large pearls (necessary to change the adaptor for sowing micro-granules)
• JohnDeere: Its not able to sow the complete dose of the pearl (only half dose)
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Observations and dataprocessing
• Inspection of regularity of sowing• Estimation of the number of early stage pests
(Corn Weevils – Tanymecus dilaticollis GILLENHAL)
• Measuring of larval damages with IOWA or Oleson-Tollefson scales
• Estimation of lodging after growth of ears• Statistical analysis
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IOWA scale
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
18,0
20,0
1 1,5 2 2,5 3 3,5 4 4,5 5 5,5 6
Scale levels
[pcs
]
Gaucho 0.26
Talstar
Mospilan
Furadan K.
Absz. K.
Results of MAVICELL and differences between treatments
Average damages in:
Control: IOWA value 5
Soil treatment (Furadan): IOWA value 4
MAVICELL treatments: Under economical
threshold (IOWA value 3,5)
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Treatment Average* Sd Multiple comparison**
Gaucho 0.26 [M] 3,14 0,92 a
Talstar [M] 3,44 1,01 a
Furadan K. 3,96 0,71 b
Mospilan [M] 4,11 1,00 b
Absz. K. 4,51 1,05 c
*: IOWA values, n=80**: No significance between data marked with the same character on α = 0,5 (Data processed with SPSS for Windows 9.0)
Statistical analysis of damaging on roots after washing
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Results
• After three years of investigation we can say: MAVICELL is able to protect maize against WCR!
• Are there any losses of quality of pearl or agents? Checking with greenhouse screening!
• Costs of a hectare are much cheaper than the same with soil insecticides!
• We need to find a reliable method or seeding-machine to sow the pearls under the rows of corn!!!
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