Clover Root Curculio Injury and Abundance in Minnesota Alfalfa of Different Stand Age

Root injury and midsummer adult abundance of clover root curculio (CRC), Sitona hispidulus (Fabricius), was surveyed in 24 different aged southeastern Minnesota alfalfa fields. CRC presence was not detected in first year fields 2-3 months following stand establishment. Increased root scarring was observed as stand age increased and most fields 3-5 years old showed heavy CRC root scarring. High CRC adult popUlations and widespread root scarring was found in second year alfalfa fields which suggests that CRC is a mobile insect capable of rapidly colonizing new plantings

Effects of Aluminum Foil Mulch on Parasitism and Fecundity of Apterous \u3ci\u3eMyzus Persicae\u3c/i\u3e (Homoptera: Aphididae)

Chinese cabbage plants grown in flats containing either aluminum foil mulch or no mulch cover were uniformly infested with a single apterous adult Myzus persicae (Sulzer) and exposed in a greenhouse to a free-flying population of the parasite Aphidius ervi (Haliday). Aphid fecundity. plant growth, and temperature were greater in reflective mulch plots. Aphid pardSitism was lower over mulched plots until foliage growth obscured the mulch. Later. parasitism was more frequent in mulched plots. The effects upon parasitism, fecundity. and microclimate may explain instances where aluminum mulches have not reduced aphid populations

Effects of Aluminum Foil Mulch on Parasitism and Fecundity of Apterous \u3ci\u3eMyzus Persicae\u3c/i\u3e (Homoptera: Aphididae)

Chinese cabbage plants grown in flats containing either aluminum foil mulch or no mulch cover were uniformly infested with a single apterous adult Myzus persicae (Sulzer) and exposed in a greenhouse to a free-flying population of the parasite Aphidius ervi (Haliday). Aphid fecundity. plant growth, and temperature were greater in reflective mulch plots. Aphid pardSitism was lower over mulched plots until foliage growth obscured the mulch. Later. parasitism was more frequent in mulched plots. The effects upon parasitism, fecundity. and microclimate may explain instances where aluminum mulches have not reduced aphid populations

\u3ci\u3ePhorodon cannabis\u3c/i\u3e Passerini (Hemiptera: Aphididae), a newly recognized pest in North America found on industrial hemp

Phorodon cannabis Passerini (Hemiptera: Aphididae: Macrosiphini) is reported for the first time as a pest of Cannabis L. crops in North America. The insect has been confirmed from fields of industrial hemp in Colorado and Virginia and has been found present within greenhouses in at least several American states and one Canadian province. The generic position of the aphid species is discussed and other known members of the genus are ruled out. Phorodon cannabis is placed in genus Phorodon Passerini and subgenus (Diphorodon Börner). Phorodon persifoliae Shinji is transferred to Hyalopterus Koch as a nomen dubium

Commercial Vegetable Weed, Insect, and Disease Control Guide: Beets, Carrots, Lettuce, Onions, Parsnips, Radishes, Rutabagas, Turnips, Spinach (Revised 1983)

This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

Chemical control of soil insect pests of corn (Revised 1983)

1 online resource (PDF, 2 pages)This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

Controlling corn rootworms (Revised 1983)

1 online resource (PDF, 2 pages)This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu

\u3ci\u3ePhorodon cannabis\u3c/i\u3e Passerini (Hemiptera: Aphididae), a newly recognized pest in North America found on industrial hemp

Phorodon cannabis Passerini (Hemiptera: Aphididae: Macrosiphini) is reported for the first time as a pest of Cannabis L. crops in North America. The insect has been confirmed from fields of industrial hemp in Colorado and Virginia and has been found present within greenhouses in at least several American states and one Canadian province. The generic position of the aphid species is discussed and other known members of the genus are ruled out. Phorodon cannabis is placed in genus Phorodon Passerini and subgenus (Diphorodon Börner). Phorodon persifoliae Shinji is transferred to Hyalopterus Koch as a nomen dubium

Phorodon lanzhouense Zhang 1999

<i>Phorodon lanzhouense</i> Zhang et al. (1999) <p> was described from five apterae on an unknown host. The process on the frontal tubercles is described as “rounded” but appears mostly lacking in the illustration. Zhang et al. (1999) state that <i>P. lanzhouense</i> most resembles <i>P. humulifoliae</i> but differs in the structure of the mesosternal furca (two parts connected in the middle like a thread, rather than a solid structure), has shorter caudal setae, and has slightly longer siphunculi relative to the length of the cauda. More work is needed to confirm the validity of this species and determine if it belongs in <i>Phorodon</i>.</p>Published as part of <i>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, pp. 1-12 in Insecta Mundi 662</i> on page 4, DOI: <a href="http://zenodo.org/record/3710022">10.5281/zenodo.3710022</a&gt

Phorodon humuli

<i>Phorodon humuli</i> (Schrank 1801) <p>(Fig. 4a–f; Fig. 5a–f)</p> <p> is the hop aphid, adventive and widespread in North America at least since 1863 (Foottit et al. 2006). Apterae of <i>P. humuli</i> can be distinguished from those of <i>P. cannabis</i> 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 <i>Cannabis</i>. The aphids overwinter on <i>Prunus</i>, particularly ornamental purple leaf plum, <i>Prunus cerasifera</i> Ehrh (Rosaceae) (S. E. Halbert, personal observation).</p>Published as part of <i>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, pp. 1-12 in Insecta Mundi 662</i> on page 3, DOI: <a href="http://zenodo.org/record/3710022">10.5281/zenodo.3710022</a&gt