James C. Sellmer

Host tree resistance against the polyphagous wood- boring beetle Anoplophora glabripennis

Anoplophora glabripennis (Motschulsky) (Coleoptera: Cerambycidae: Lamiini) is an invasive wood‐boring beetle with an unusually broad host range and a proven ability to increase its host range as it colonizes new areas and encounters new tree species. The beetle is native to eastern Asia and has become an invasive pest in North America and Europe, stimulating interest in delineating host and non‐host tree species more clearly. When offered a choice among four species of living trees in a greenhouse, adult A. glabripennis fed more on golden‐rain tree (Koelreuteria paniculata Laxmann) and river birch (Betula nigra L.) than on London planetree (Platanus × acerifolia (Aiton) Willdenow) or callery pear (Pyrus calleryana Decaisne). Oviposition rate was highest in golden‐rain tree, but larval mortality was also high and larval growth was slowest in this tree species. Oviposition rate was lowest in callery pear, and larvae failed to survive in this tree species, whether they eclosed from eggs laid in the trees or were manually inserted into the trees. Adult beetles feeding on callery pear had a reduced longevity and females feeding only on callery pear failed to develop any eggs. The resistance of golden‐rain tree against the larvae appears to operate primarily through the physical mechanism of abundant sap flow. The resistance of callery pear against both larvae and adults appears to operate through the chemical composition of the tree, which may include compounds that are toxic or which otherwise interfere with normal growth and development of the beetle. Unlike river birch or London planetree, both golden‐rain tree and callery pear are present in the native range of A. glabripennis and may therefore have developed resistance to the beetle by virtue of exposure to attack during their evolutionary history.

Oviposition Preference and Larval Performance of Anoplophora glabripennis (Coleoptera: Cerambycidae) in Four Eastern North American Hardwood Tree Species

Abstract Anoplophora glabripennis (Motschulsky) is an invasive wood-boring cerambycid beetle that kills hardwood trees. The host range of this species is unusually broad but is not well defined in the available literature and may include tree species that have not been reported as hosts because they have not previously been exposed to the beetle. We evaluated oviposition by A. glabripennis offered a choice of four common eastern North American forest and landscape hardwood tree species, and performance of the resulting larvae, under greenhouse conditions. Significantly greater numbers of oviposition sites were found on sugar maple, Acer saccharum Marshall, than on red maple, Acer rubrum L., green ash, Fraxinus pennsylvanica Marshall, or red oak, Quercus rubra L., with no significant differences among the other three tree species. Similarly, significantly greater numbers of living larvae were found in sugar maple than in the other tree species; however, more were found in red oak and fewer in green ash than expected, considering relative numbers of oviposition sites. After 90 d, mean mass of living larvae did not differ significantly among tree species. These results suggest that all four tree species may be suitable hosts for A. glabripennis. Most importantly, although larval establishment was poor in green ash and larval growth may have been retarded in red oak, larvae did survive and grow in both species. We recommend that these tree species be considered potential hosts when surveys are conducted to detect infested trees or when replanting infested areas.

Behavior of Adult Anoplophora glabripennis on Different Tree Species Under Greenhouse Conditions

We observed behaviors and compiled activity budgets of adult Anoplophora glabripennis (Coleoptera: Cerambycidae) given a choice of different species of living trees as hosts in a greenhouse. Frequency of observation of beetles on different tree species provided a good overall indicator of host preference. Beetles were most often observed resting; they were least active early in the day and most active late in the day, but mating was observed with equal frequency during all 4-h time intervals between 0800 and 2400 h. Adults of both sexes were promiscuous, mating repeatedly and with different partners. Males engaged in mate guarding for periods of several hours or more to ensure paternity of the guarded females progeny.

Preemergence and Postemergence Suppression of Kochia on Rights-of-Way

Abstract Kochia poses a challenge to vegetation management in both agricultural and noncrop areas. This species has developed widespread resistance to several herbicides with differing modes of action, including acetolactate synthase inhibitors and photosynthesis inhibitors. Resistance is also beginning to appear against the synthetic auxins and glycines. Therefore, alternative PRE and POST herbicides are needed for effective kochia management, especially in roadside bare-ground zones. Both PRE and POST herbicides were screened on rights-of-way in Pennsylvania. Mixtures containing diuron, flumioxazin, sulfentrazone, pendimethalin, prodiamine, and bromacil were evaluated for PRE activity in combination with glyphosate. POST kochia control was assessed for 15 noncrop herbicides. Results from all trials varied with kochia size and vigor at time of treatment. Although diuron is the current industry standard for PRE control in tank mixes, sulfentrazone appeared to have the most POST activity against vigorously growing kochia. All PRE herbicides evaluated performed better than the standard, sulfometuron plus chlorsulfuron alone. Dicamba, dicamba plus diflufenzopyr, fluroxypyr, and glyphosate performed best against kochia when applied POST. The recently available chemistries saflufenacil and aminocyclopyrachlor require further evaluation of application timing and use rates, respectively, for POST activity on kochia. Nomenclature: Aminocyclopyrachlor, 6-amino-5-chloro-2-cyclopropyl-4-pyrimidinecarboxylic acid; bromacil; chlorsulfuron; diflufenzopyr, 2-(1-[([3,5-difluorophenylamino] carbonyl)-hydrazono]ethyl)-3-pyridinecarboxylic acid; dicamba; diuron; flumioxazin; fluroxypyr; glyphosate; pendimethalin; prodiamine; saflufenacil, 2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-4-fluoro-N-[[methyl(1-methylethyl)amino]sulfonyl]benzamide; sulfentrazone; sulfometuron; kochia, Kochia scoparia (L.) Schrad

Guide to Selecting and Specifying Nursery Stock

Successfully planting of trees in urban areas is a difficult task. There are many things that must be done accurately, and a mistake in only one area can result in the failure of the plantation. Sites must be selected and evaluated thoroughly to determine if trees are appropriate for them, and if there is sufficient suitable soil to support their growth. Species that are adaptable to the site conditions must be selected and then located and purchased. The trees must be planted properly and maintained until established in the site. It is the objective of this chapter to define the factors that make a high-quality tree, and help urban tree managers locate and purchase high-quality trees for their communities.

Guide to Selecting and Specifying Quality Nursery Stock

Successfully planting trees in urban areas is a difficult task. Many things must be done right, and a mistake in only one area can result in the failure of the planting. Sites must be selected and evaluated thoroughly to determine whether trees are appropriate for them and whether there is sufficient suitable soil to support their growth. Species that are adaptable to the site conditions must be selected. The trees selected then must be located and purchased. The trees must be planted properly and maintained until established in the site. It is the objective of this chapter to define the factors that make a high-quality tree and help urban tree managers locate and purchase high-quality trees for their communities.