Egyptian alfalfa weevil …breeding resistant alfalfa
THE USE OF ALFALFA VARIETIES resistant to the alfalfa weevil (Hypera brunneipennis (Boh.)) offers a sure, inexpensive means of controlling this pest. Results of work conducted at the University of California and elsewhere show that development of varieties resistant to the alfalfa weevil is possible. However, unlike resistance to the spotted alfalfa aphid, where wide differences in reactions were found among plants tested, only relatively small differences in the levels of resistance have been found among plants tested for the alfalfa weevil. These small increments in the levels of resistance will probably have to be combined into a higher level through generations of cross breeding and selection. The number of generations necessary is not known, but a lower number may be possible if use of such varieties is combined with an adequate level of biological control and good crop management.