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| Evaluation of Treatments in 1997 in MN and IA |
T = 1 - [Nt/Nt -1]*[nt -1/nt] Index of colony presence C = Nt/nt  Treatment Evaluation | Nt and nt are average moth counts in
pheromone traps in year t in the treatment block and in the control area around it, respectively.
Treatment is done in year t. In the case of mating disruption or intensive
trapping, evaluation is performed in year t +1. Thus, Nt and nt
in equations for T and C are replaced by Nt+1 and
nt+1. If values of nt-1 or nt are less than 0.05, then they are
replaced by the value of 0.05 for estimating of T.
Treatment is successful if T > 0.67; partially successful if 0.33 < T < 0.67; and unsuccessful if T < 0.33.
If C is much >1, then the colony is still present and may require additional treatments.
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# Block Name State County Agent Dose Area,ac T T2 C PPA |
PPA = Potential Problem Area, detected by the Decision Algorithm from previous year data.
Treatment agents: Btk (or Bt, BT) = Bacillus thuringiensis var. kurstaki;
MD (or PF) = Mating disruption with pheromone flakes containing disparlure;
NPV = virus, preparation Gypchek;
DIM = Dimilin (=diflubenzuron);
Trap = Mass trapping;
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For more information, please contact Patrick Tobin or Andy Roberts
Maintained By Jiang Wu