By John C. Kricher
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Extra info for A field guide to California and Pacific Northwest forests
In populations released as loose cocoons, high pre-nesting female dispersal (up to 50 percent) can be expected. If it is necessary to work with loose cocoons, female cocoons may be inserted individually into the bottoms of the nesting cavities. If this is too time-consuming, cocoons should, at least, be placed in some kind of emergence box, such as a wooden or cardboard box with holes through which bees can fly. How to Release BOB Populations in Orchards / 37 Normally, BOB females prefer to nest in new cavities rather than in old, used ones.
Timing BOB Emergence with Orchard Bloom In garden situations, with few flowers to pollinate and several plant species blooming consecutively, precise timing of BOB emergence with bloom of a particular plant is generally not a major concern. In commercial orchards, however, timing is critical. If females emerge when there are still no open flowers, many will disperse to search for blooming plants and nest elsewhere. If bees are released too late, the valuable early bloom will not be pollinated. Because most commercial orchards only bloom for two to three weeks, bees may not have enough pollen-nectar resources for adequate nesting if they miss too many days of bloom.
5 m) above the ground or higher. In addition to adequate nesting cavities and pollen-nectar resources (Table 1, page 13), BOB females require a mud source to build cell partitions. Irrigation ditches or leaking irrigation pipes frequently provide adequate mud sources. If these are not available, a shallow trench may be dug near the nesting site and kept moist during the nesting period. 5 inches [37 mm]) screen to prevent bird predation of BOB females during mud collection (Figure 23). Installing nesting units near mud and flower sources will shorten foraging trips and increase cell production rate and pollination.
A field guide to California and Pacific Northwest forests by John C. Kricher