Budworms brother, BT sprays can help with the actual presence of the cats but like thumper said, cut it out clean the area. Only thing you can do about rot once its there is remove it and move on. You know your source of whats causing it, manual hunting the budworms is the best way to go about it. BT is "safe" to spray up till harvest but I guess its never a good idea to spray flowers unless you absolutely have to so use discretion if you plan on it. Be vigilant! Cats are no joke, can be as small as a grain of rice and burrow into your flowers making it nearly impossible to see them if you dont know what to look for. Most people notice them only after seeing what you have going on. Next season preventative BT spraying before flower and through the first few weeks would work great.