Population Dynamics of Mesocriconema xenoplax Parasitizing Sweet Cherry Trees in British Columbia, Canada

Figure 1:

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Figure 3:

Maximum, minimum, and overall mean population densities of Mesocriconema xenoplax (M_ xenoplax/100 cm3 soil) for each of the five population years (April 1 through March 31, variable number of sample dates per year) in a sweet cherry orchard in Summerland, British Columbia_ Month names in parentheses are the month in which the maximum or minimum was recorded_ The two “Date p-values” for each year are p-values from repeated measures analyses of effect of sample date for the entire population year and for the growing season (April through October), respectively_

Year	Maximum	Minimum	Mean	Date p-value
2018–19 (n = 55)	181 (June)	39 (May)	101	0.08, 0.04
2019–20 (n = 50)	217 (March)	61 (April)	122	0.06, 0.09
2020–21 (n = 40)	117 (September)	26 (July)	69	0.04, 0.15
2021–22 (n = 50)	133 (July)	43 (October)	87	0.13, 0.13
2022–23 (n = 40)	183 (March)	48 (June)	89	0.20, 0.18

Summary of soil temperatures at 15-cm depth and seasonal milestones for the five population years (April 1 through March 31) of the study_ Column headings “Date > 10°C” and “Date < 10°C” are the dates on which soil temperatures rose above 10°C or dropped below 10°C, respectively_ “Max_ (date)” and “Min_ (date)” refer to maximum and minimum temperatures recorded within each population year and the dates they were recorded_ “DD total” refers to the total number of degree-days accumulated through the year, calculated using base 0°C_

Year	Date > 10°C	Max. (date)	Date < 10°C	DD total	Min. (date)
2018–19	21 April	20 (11 Aug)	3 Oct	3172	−2.9 (10 Feb)
2019–20	18 April	20 (10 Aug)	8 Oct	3234	−0.4 (15 Jan)
2020–21	18 April	20 (1 Aug)	13 Oct	3305	−3.0 (12 Feb)
2021–22	16 April	23 (1 July)	8 Oct	3379	0 (27 Dec)
2022–23	29 April	22 (28 July)	18 Oct	3190	−2.9 (22 Dec)