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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 m 2 , 5.0 mil./10 m 2  (the recommended dose) and 2.5 mil./10 m 2 ) 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.

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