Pesticide-sensitivity
Guides
Encarsia citrina
Encarsia citrina is a minute parasitoid wasp in the family Aphelinidae that serves as an important biological control agent of armored scale insects. The species attacks multiple scale hosts including euonymus scale (Unaspis euonymi), greedy scale (Hemiberlesia rapax), and Fiorinia externa. Research has demonstrated that pesticide applications can significantly reduce parasitoid populations and disrupt biological control services. The species exhibits temperature-dependent searching efficiency and host age preference in its foraging behavior.
Gastrophysa polygoni
Knotweed Leaf Beetle
Gastrophysa polygoni is a small leaf beetle in the subfamily Chrysomelinae, described by Carl Linnaeus in 1758. Adults reach approximately 5 mm in length and display distinctive coloration: metallic green wing cases (elytra), green-blue body, and orange thorax. The species is native to Europe and has become established in North America, where it was introduced early in colonial settlement. It feeds primarily on Polygonaceae plants, serving as a beneficial biological control agent for weeds such as knotweeds and docks, though it occasionally damages cultivated buckwheat. The beetle exhibits complex reproductive behaviors including olfactory examination of airspace, track marking by females, and post-copulatory cleaning rituals.
Osmia lignaria lignaria
Eastern Blue Orchard Bee
Osmia lignaria lignaria is the eastern subspecies of the blue orchard bee, a solitary mason bee native to North America. It is a managed pollinator prized for its efficiency in pollinating early spring-blooming fruit trees including almonds, apples, pears, and cherries. The bee nests in pre-existing cavities such as hollow stems and beetle holes, sealing nest entrances with mud. It has experienced population declines in the eastern United States, with research ongoing into competition with non-native Osmia species and vulnerability to pesticides and parasites.
Poecilus
Greenclock Ground Beetles
Poecilus is a genus of ground beetles in the family Carabidae, comprising approximately 144 species distributed across the Afro-tropical region, Palearctic (including Europe), the Near East, North Africa, and North America. Species within this genus are frequently encountered in agricultural landscapes, where they contribute significantly to epigeal (ground-dwelling) arthropod communities. Multiple species often occur sympatrically, exhibiting spatial partitioning within habitats. The genus has been extensively studied as a bioindicator of agricultural practices and environmental disturbance due to its sensitivity to soil management techniques and pesticide exposure.
Xenoglossa
Squash Bees and Allies, Squash Bees
Xenoglossa is a genus of large bees in the family Apidae, commonly known as squash bees. Species in this genus are oligolectic pollen specialists, with most species foraging exclusively on Cucurbita crops (Cucurbitaceae). Some species, such as X. (Cemolobus) ipomoeae, specialize on Ipomoea (Convolvulaceae) instead. These solitary, ground-nesting bees are native to North America and are important agricultural pollinators. Adults are active for a brief period in summer, coinciding with host plant bloom.
Xenoglossa angustior
Red-tailed Squash Bee
Xenoglossa angustior, the Red-tailed Squash Bee, is a specialist pollinator of cucurbits (Cucurbitaceae) in the tribe Eucerini. It is native to North and Middle America and shares the common name "squash bee" with the related genus Peponapis. Both genera are oligoleges that pollinate exclusively squash, pumpkins, gourds, cucumbers, and zucchini.