Pear psylla and natural enemy thresholds for successful integrated pest management in pears.

Autor:	DuPont ST; College of Agriculture and Natural Resources, Washington State University, Tree Fruit Research and Extension Center, 1100 N Western Ave, Wenatchee, WA 98801, USA., Strohm C; College of Agriculture and Natural Resources, Washington State University, Tree Fruit Research and Extension Center, 1100 N Western Ave, Wenatchee, WA 98801, USA., Kogan C; Department of Mathematics and Statistics, Washington State University, Statistics, Spokane WA, USA., Hilton R; College of Agricultural Sciences, Oregon State University, Southern Oregon Research and Extension Center, 569 Hanley Rd, Central Point, Oregon 97502, USA., Nottingham L; Department of Entomology, Washington State University, Northwestern WA Research and Extension Center, 16650 State Route 536, Mount Vernon, WA 98273, USA., Orpet R; College of Agriculture and Natural Resources, Washington State University, Tree Fruit Research and Extension Center, 1100 N Western Ave, Wenatchee, WA 98801, USA.
Jazyk:	angličtina
Zdroj:	Journal of economic entomology [J Econ Entomol] 2023 Aug 10; Vol. 116 (4), pp. 1249-1260.
DOI:	10.1093/jee/toad101
Abstrakt:	Pear psylla, Cacopsylla pyricola (Förster), is the most economically challenging pest of commercial pears in Washington and Oregon, the top producers of pears in the United States. The objective of this study was to quantify economic injury levels and thresholds for pear psylla. We used the relationship between pear psylla adult and nymph densities, and fruit downgraded due to psylla honeydew marking to identify injury levels. We calculated economic injury levels using the cost of downgraded fruit and average management costs (spray materials and labor). Using economic injury levels, we determined economic thresholds for pear psylla, which include predicted pest population growth, natural enemy predation, and anticipated delays between when pest populations are measured and when managers apply interventions. Economic thresholds generated by this study were 0.1-0.3 second-generation nymphs per leaf and 0.2-0.8 third-generation nymphs per leaf depending on predicted price and yield for insecticide applications at 1,300 pear psylla degree days in the second generation and 2,600 pear psylla degree days in the third generation. Natural enemy inaction thresholds identified by this study were 6 Deraeocoris brevis or 3 Campylomma verbasci immatures per 30 trays or 2 earwigs per trap for third-generation optional insecticide applications. (© The Author(s) 2023. Published by Oxford University Press on behalf of Entomological Society of America.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu