Management of the Diamondback Moth and Other Crucifer Insect ...

Table 1. Original (Zalucki and Furlong 2008) and modified CLIMEX parameter (Param) values, their definition andsources that gave the best visual fit to the distribution of Plutella xylostella in Australia and Africa (see text fordetails).LimitingprocessTemperatureMoistureCold StressHeat StressDry StressParamDV0 7DV1 14DV2 28OriginalvaluesDV3 34 38ChangedtoUnits Definition SourceO C Lower temperature threshold; below thistemperature the population will not growO CO CLower optimum temperatureUpper optimum temperature; between DV1 & DV2population growth is maximalO C Upper temperature threshold; above thistemperature populations will not growSM0 0.05 % Lower soil moisture threshold; below this moisturelevel the population will not growSM1 1 0.5 % Lower optimum soil moistureSM2 1.5 1.25 % Upper optimum soil moisture; between SM1 &SM2 population growth is maximalSM3 2.5 1.75 % Upper soil moisture threshold; above this moisturelevel populations will not growDTCS 15 12 DegreeDaysThreshold number of degree-days below DV0 atwhich cold stress begins to accumulate.DHCS -0.0005 Rate at which cold stress accumulates when thethreshold number of degree-days below DV0(DTCS) is reachedTTCS 4O CTemperature threshold at which cold stress beginsto accumulateTHCS -0.0001 -0.0005 / O C/day Rate at which cold stress accumulates when Tmin TTHSDTHS 1 DegreeDaysThreshold number of degree-days above DV3 atwhich heat stress begins to accumulate.DHHS 0.005 Rate at which heat stress accumulates when thethreshold number of degree-days above DV0(DTHS) is reachedSMDS 0.2 0.05 % Soil moisture threshold at which dry stress beginsto accumulateHDS -0.005 /day Rate at which dry stress accumulates when SM isbelow SMDSLiu et al.(2002)FittedLiu et al.(2002)FittedFittedFittedLiu et al.(2002)FittedLiu et al.(2002)FittedFitted10 AVRDC - The World Vegetable Center