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Insects Feeding
on these Plants:

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Catalpa spp.
(Catalpa) [Bignoniaceae]
(Observations are from Wagner, Covell, Aldrich & Osten-Sacken, Felt, Wheeler et al., Pepper, Spencer & Steyskal, Cranshaw, ScaleNet)

Diptera (Flies)
Agromyzidae: Amauromyza pleuralis [larvae are blotch leaf-miners; found in Illinois, Ohio, & Canada] SS1986; Cecidomyiidae: Contarinia catalpae (Catalpa Midge) [larvae are found in seedpods, they also cause leaf spots and damage terminal buds] AOS1905 Flt1917

Heteroptera (True Bugs)
Miridae: Phytocoris erectus WHM1983

Homoptera (Sucking Insects)
Aphididae: Aphis fabae (Black Bean Aphid) [polyphagous] Pp1965, Aphis gossypii (Cotton Aphid) [Catalpa is one of the winter hosts of this aphid] Crw2004; Diaspididae: 
Clavaspis ulmi (Elm Armored Scale) [usually found on rough bark, preferring Ulmus spp. as host plants; this insect occurs in E USA & Ontario] SN2014, Diaspidiotus ancylis (Putnam Scale) [found on leaves, sometimes bark, polyphagous; this insect is widely distributed in the USA] SN2014, Lepidosaphes ulmi (Oystershell Scale) [found on bark, polyphagous; this insect is widely distributed in the USA, S Canada, & Eurasia] SN2014, Melanaspis tenebricosa (Gloomy Scale) [found on bark, polyphagous; this insect occurs in E USA & California] SN2014, Pseudaulacaspis pentagona (White Peach Scale) [polyphagous; this insect is found mostly in E USA, it was introduced from Eurasia] SN2014; Pseudococcidae: Heliococcus osborni (Osborn Mealybug) [polyphagous, mostly found on woody vegetation] SN2014, Heliococcus stachyos [found on twigs, branches, & roots; this insect has been found in Ohio, Virginia, West Virginia, Washington DC, & California] SN2014, Pseudococcus comstocki (Comstock Mealybug) [found on foliage, including lower side of leaves; polyphagous, feeding on woody vegetation; this insect is widely distributed in NE & north-central USA, it is also found in Ontario] SN2014, Pseudococcus maritimus (Grape Mealybug) [found on foliage, polyphagous; this insect is widely distributed] SN2014

Lepidoptera (Butterflies, Skippers, & Moths)

Sphingidae: Ceratomia catalpae (Catalpa Sphinx) [oligophagous] Cv2005 Wg2005
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