Question: query regarding shrinkage of bottle gourd leaves after application of tracel. 
Answer: if you noticed such type of abnormalities then please stop the application in the plants.  instead of tracel you may spray mohaphol 2ml/liter or planofix 1 ml/4 liter of water once at optimum vegetative growth stage, once at flowering stage, once at fruit setting stage in the evening time in the absence of rain. you may also spray borax 5-6 gram per liter of water.