diff --git a/src/main/java/no/nibio/vips/logic/scheduling/model/preprocessor/BremiaLactucaeModelPreprocessor.java b/src/main/java/no/nibio/vips/logic/scheduling/model/preprocessor/BremiaLactucaeModelPreprocessor.java
index 55fdb4cc716b08e6d814276df5e99141dad9db2a..067c032c6c1a625f5ea01a681951db5e2f4c1579 100755
--- a/src/main/java/no/nibio/vips/logic/scheduling/model/preprocessor/BremiaLactucaeModelPreprocessor.java
+++ b/src/main/java/no/nibio/vips/logic/scheduling/model/preprocessor/BremiaLactucaeModelPreprocessor.java
@@ -79,7 +79,7 @@ public class BremiaLactucaeModelPreprocessor extends ModelRunPreprocessor {
             {
                 BTg = BT;
             }
-            if(BTg.size() != TX.size())
+            if(BTg.size() != TM.size())
             {
                 BTg = wUtil.calculateLeafWetnessHourSeriesBestEffort(BTg,TM, RR, null,null, UM);
             }