Density yield relationships and economic injury level model for the Colorado potato beetle larvae on potatoes

Abstract Economic thresholds (ETs) are a foundational principle of integrated pest management but are not always widely accepted by farmers and agricultural professionals. This article reports on a survey of Minnesota farmer and agricultural professional perceptions of the ET for soybean aphid, Aphis glycines Matsumura (Hempitera: Aphididae). We discuss insights for Extension programs on how to frame the importance of thresholds and teach stakeholders to use them effectively. Key takeaways include farmers and agricultural professionals often worry about combined effects of insect, disease, and physiological pressures, whereas effects of interactions with these other stressors are seldom discussed in educational outreach. Across groups, there is a fundamental misunderstanding about the difference between ETs and economic injury level. Many survey participants reported believing in the ET but lacked the time and capacity to fully implement it. Sales agronomists and farmers were the least likely groups to trust the university-determined soybean aphid ET, whereas commercial pesticide applicators and independent consultants were the most likely groups to trust it. Based on these results, we recommend adapting communication about ETs based on the target audience to address common misconceptions and barriers to ET use that are unique to each group.

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AFLP-Based Genetic Linkage Map of the Colorado Potato Beetle Leptinotarsa decemlineata: Sex Chromosomes and a Pyrethroid-Resistance Candidate Gene

Genetics ◽

10.1093/genetics/158.2.695 ◽

2001 ◽

Vol 158 (2) ◽

pp. 695-700 ◽

Cited By ~ 1

Author(s):

David J Hawthorne

Keyword(s):

Candidate Gene ◽

Linkage Map ◽

Colorado Potato Beetle ◽

Leptinotarsa Decemlineata ◽

Genetic Linkage ◽

Genetic Linkage Map ◽

Sex Chromosome ◽

Pyrethroid Resistance ◽

Codominant Markers ◽

Potato Beetle

Abstract A genetic linkage map was constructed from an intraspecific cross of the Colorado potato beetle, Leptinotarsa decemlineata. This is an initial step toward mapping the loci that underlie important phenotypes associated with insect adaptation to an agroecosystem. The map was made with 172 AFLP and 10 anonymous codominant markers segregating among 74 backcross (BC1) individuals. Markers were mapped to 18 linkage groups and a subset of the markers with a mean intermarker distance of 11.1 cM is presented. A pyrethroid-resistance candidate gene, LdVssc1, was placed onto the map as well. The sex chromosome was identified by exploiting the XO nature of sex determination in this species using patterns of variation at LdVssc1 and the codominant markers.

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Economic injury level for Tetranychus urticae Koch on parthenocarpic cucumber under protected environment in north-western Indian Himalayas

Phytoparasitica ◽

10.1007/s12600-021-00912-0 ◽

2021 ◽

Author(s):

Dilip Shriram Ghongade ◽

Ajay Kumar Sood

Keyword(s):

Tetranychus Urticae ◽

Economic Injury Level ◽

Economic Injury ◽

Tetranychus Urticae Koch ◽

North Western ◽

Indian Himalayas

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Field Efficacy of Steinernema sp. (Rhabditida: Steinernematidae) on the Colorado Potato Beetle Overwintering Generation

Plants ◽

10.3390/plants10071464 ◽

2021 ◽

Vol 10 (7) ◽

pp. 1464

Author(s):

Maja Čačija ◽

Renata Bažok ◽

Majda Kolenc ◽

Tena Bujas ◽

Zrinka Drmić ◽

...

Keyword(s):

Colorado Potato Beetle ◽

First Generation ◽

Control Measures ◽

Recommended Dose ◽

Steinernema Feltiae ◽

First Year ◽

Potato Beetle ◽

Field Efficacy ◽

Second Year ◽

Economic Pest

Colorado potato beetle (CPB) is an economic pest of potato that has developed resistance to all classes of chemical insecticides, thus requiring alternative control measures. As a potential solution, entomopathogenic nematodes (EPNs) have proven effective in suppressing this pest, but their efficacy against overwintering generations of CPB in Croatia has not been sufficiently researched. The aim of this two-year (2018–2019) field study was to determine the efficacy of Steinernema feltiae and Steinernema carpocapsae applied to overwintering CPB adults. EPNs were applied at three doses (7.5 mil./10 m2, 5.0 mil./10 m2 (the recommended dose) and 2.5 mil./10 m2) by watering the soil where the adults were overwintering. The first-year results were satisfactory for both EPNs: the efficacy of S. feltiae ranged from 79.03% to 100.00%, while the efficacy of S. carpocapsae ranged from 77.32% to 96.22%. In the second year, the highest efficacy (69.57%) was obtained using the recommended dose of S. feltiae. Although the results are not consistent across the two years of our study and suggest further research, they indicate that EPNs have great potential in controlling overwintering CPB generations to reduce first generation abundance and damage, and also to prevent the spread of new generations to surrounding potato growing areas.

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