Effects of Nitrogen Fertilization on Potato Leafhopper (Hemiptera: Cicadellidae) and Maple Spider Mite (Acari: Tetranychidae) on Nursery-Grown Maples

Prado, Julia; Quesada, Carlos R.; Gosney, Michael J.; Mickelbart, Michael V.; Sadof, Clifford S.

doi:10.1093/jee/tov105

Cited by 6 publications

(1 citation statement)

References 42 publications

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“…A repeated measures anova , using proc mixed and a controlled spherical model with the Kenward–Roger approximation to calculate degrees of freedom, was used to determine whether significant variation was present in survivorship among all four combinations of grafted Manchurian and green ash, as well as Manchurian and green nongrafted trees and between conspecific grafted trees. Cumulative density of EAB was calculated as the number of beetle days using the equation:

Beetle days = \sum ((N_{((), normalx + 1)} + N_{((), x)}) / 2) * D_{(x + 1) x})

where N is the population of beetles on sampling day x and D (x + 1)x is the number of days between sampling dates, making beetle days the average number of beetles between each pair of observations multiplied by the number of days between observations (Prado et al ., ).…”

Section: Methodsmentioning

confidence: 97%

Effects of grafting on host plant resistance in ash (Fraxinusspp.) to emerald ash borer (Agrilus planipennisFairmaire)

Stack

Sadof

Ginzel

2018

Agri and Forest Entomology

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1 The invasive emerald ash borer (EAB) (Agrilus planipennis Fairmaire Coleoptera: Buprestidae) is a phloem-boring pest from Asia that has killed hundreds of millions of North American ash trees (Fraxinus spp.). Propagation of trees resistant to EAB must be explored as a tool to maintain the North American ash resource. 2 Interactions between the root and shoot of a tree may be critical to its ability to resist attack by insects and pathogens because many secondary metabolites critical to plant defence are synthesized in the roots. 3 In the present study, we determined the extent to which grafting susceptible green ash (Fraxinus pennsylvanica Marshall) and resistant Manchurian ash (Fraxinus mandshurica Rupr.) affects EAB resistance in ash trees. We measured adult EAB survivorship, herbivory, fecundity and morphological tree characteristics on grafted and nongrafted green and Manchurian ash. 4 Among grafted trees, beetles caged on grafted green ash lived four days longer and laid at least three times more eggs than beetles caged on trees with a Manchurian ash scion or rootstock. Herbivory was unaffected by graft combination. 5 Our findings suggest that grafted trees with Manchurian ash rootstocks or scions will be more resistant to EAB than nongrafted green ash trees.

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