I have what I think are moth caterpillars on my calamondin and lemon tree. I have brought them into the conservatory for winter. I get them every year but not in the same quantity that I've got them this year. They only come out at night, are small and green (about 1cm at most in length and about 2-3mm wide). In the day they wrap themselves in a sort of silky web between leaves. I have been going through it finding these stuck together leaves and squishing them. Are there any better solutions? And is there any way to avoid them in the future?