Abstract
The pine reproduction weevil causes serious losses in young plantations of Pinus jeffreyi Grev. & Balf and P. ponderosa Laws. Crossing P. Jeffreyi with P. coulteri D. Don. produces resistant progenies. A three-way hybrid of these two and P. ponderosa is also resistant. The mode of action of resistance is not known though nonpreference, antibiosis, and tolerance all are indicated. Within-species variation in resistance appears to be heritable. Both within- and between-species resistance may be imparted by either parent, though indications are that it may be more attributable to the female parent. Progenies from selfpollination of recognized hosts are less resistant than progenies from non-selfing. Hany pine species and hybrids have been classified as resistant or non-resistant from data of forced attacks and natural infestations. A large-scalc pollination project is underway to produce weevil-resistant pines for tree planting in California.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
