Phorodon humuli ( Schrank 1801 )

Cranshaw, Whitney S., Halbert, Susan E., Favret, Colin, Britt, Kadie E. & Miller, Gary L., 2018, Phorodon cannabis Passerini (Hemiptera: Aphididae), a newly recognized pest in North America found on industrial hemp, Insecta Mundi 662, pp. 1-12 : 3

Phorodon humuli ( Schrank 1801)

( Fig. 4a–f ; Fig. 5a–f )

is the hop aphid, adventive and widespread in North America at least since 1863 ( Foottit et al. 2006). Apterae of P. humuli can be distinguished from those of P. cannabis by the absence of flabellate setae and by shorter setae on antennal segment III ( Fig. 2b and 4b ). This species is common and damaging on hops in North America, especially in the Pacific Northwest and is not known from Cannabis. The aphids overwinter on Prunus , particularly ornamental purple leaf plum, Prunus cerasifera Ehrh (Rosaceae) (S. E. Halbert, personal observation).

Figures

Figure 2. Phorodon cannabis Passerini. a) Apterous vivipara photomicrograph. b) Antennal segments II–VI. c) Siphunculus. d) Head and antennal segment I (left side dorsum; right side venter). e) Cauda dorsum. f) Enlargement of dorsal abdominal spatulate setae.

Figure 4. Phorodon humuli (Schrank). a) Apterous vivipara photomicrograph. b) Antennal segments II–VI. c) Siphunculus. d) Head and antennal segment I (left side dorsum; right side venter). e) Cauda dorsum.

Figure 5. Phorodon humuli (Schrank). a) Alate vivipara photomicrograph. b) Antennal segments II–VI. c) Siphunculus. d) Head and antennal segment I (left side dorsum; right side venter). e) Cauda dorsum.