| effects of fungicide and adjuvant sprays on nesting behavior in two managed solitary bees, osmia lignaria and megachile rotundata. | there is a growing body of empirical evidence showing that wild and managed bees are negatively impacted by various pesticides that are applied in agroecosystems around the world. the lethal and sublethal effects of two widely used fungicides and one adjuvant were assessed in cage studies in california on blue orchard bees, osmia lignaria, and in cage studies in utah on alfalfa leafcutting bees, megachile rotundata. the fungicides tested were rovral 4f (iprodione) and pristine (mixture of pyracl ... | 2015 | 26274401 |
| intended release and actual retention of alfalfa leafcutting bees (hymenoptera: megachilidae) for pollination in commercial alfalfa seed fields. | low, medium, and high stocking densities (15,000; 30,000; and 45,000-50,000 bees per acre, respectively) of megachile rotundata (f.) (hymenoptera: megachilidae), the alfalfa leafcutting bee, were released over 4 yr in three research plots of utah alfalfa, medicago sativa l. (fabaceae), planted at seed-production rates. a low percentage of bees (46-79% of released) survived the incubation and field-emergence processes; of those bees, the number of females that established at the nesting sites was ... | 2013 | 23786042 |
| effects of the insect growth regulator, novaluron on immature alfalfa leafcutting bees, megachile rotundata. | alfalfa leafcutting bees, megachile rotundata f. (hymenoptera: megachilidae), are the most common pollinators of alfalfa in the pacific northwest. reports from users of m. rotundata in idaho, utah and colorado have indicated exceptionally poor bee return from fields treated with novaluron to control lygus spp. our goal was to evaluate novaluron toxicity to immature m. rotundata using two different possible mechanisms of exposure. one goal was to assess immature mortality via treating nectar-poll ... | 2011 | 21539417 |
| effects of the insecticide phosmet on solitary bee foraging and nesting in orchards of capitol reef national park, utah. | capitol reef national park, in southcentral utah, contains 22 small orchards planted with antique fruit varieties by mormon pioneers beginning over a century ago. the orchards continue to be managed in a pick-and-pay program, which includes spraying with phosmet to suppress codling moth (cydia pomonella l.). the park is also home to a rich diversity of flowering plants, many of which are rare, bee-pollinated, and have populations within 1 km of the orchards. over 3 yr, we studied the short-term ... | 2007 | 17716471 |