Acarina (2001) 9, 167-174

N.M. Okulova, E.A. Scadinya and T.K. Bobrovskikh (2001)
Factors affecting the abundance of the taiga tick Ixodes persulcatus Sch. in north-western part of its area
Acarina 9 (1), 167-174
Abstract: The analysis of factors influencing the abundance dynamics of the taiga tick Ixodes persulcatus in the eastern province of Latvia during 11 years and in the southern part of Karelia during 9 years was carried out. The basic factors (x) significant for the tick abundance (8 for Latvia and 13 for Karelia) were revealed by means of the correlation analysis method. The equations of multiple regression were composed which are appropriate for forecasting the tick abundance (as a number of adult ticks per 1 km during the whole season). In the equation for Latvia three factors were used: x₁ - the sum of mean monthly temperature for August-September of the preceding year (determination coefficient R₂ = 0.79), x₄ - the same for December-January of preceding winter, R₂ = 0.504; and x₇ - the mean temperature in April (R = 0.151). In Karelia two factors were selected: x₁ (R₂ = 0.831) and x₄ (R₂ = 0.675). The observed and calculated data coincide in both cases with R₂ =1. The usage of these equations is limited by conditions presented in learning matrix.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ixodes persulcatus		Latvia
	Ixodes persulcatus		Russia (Eur.)
	Margaropus winthemi		South Africa