Abstract
The seed weevil (Microlarinus lareynii Jacquelin duVal) and the stem weevil (M. lypriformis Wollaston) were introduced into the United States and the West Indies to control puncturevine (Tribulus terrestris L.) and Jamaica feverplant (T. cistoides L.). In 14 yr these weevils have partially controlled these weeds in most areas where weevil establishment has occurred. However, indigenous parasitoids, predators, and cold weather affect weevil densities. Presently a coldhardy strain of seed and stem weevils has become established in Nevada and promise control in colder areas.