It looks like the pest is attacking during the fresh growth flush. The rolled up leaves are typical of caterpillars. Guava when growing strong is very resistant and should have little pest problems. Can you post some photos of the overall plants, how old they are, what the environment they are growing in is like? You are really going to have to identify what is happening to your fresh young growth and just spraying might help for a while but maybe not, as quick fixes usually do.