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Table 1 Functional response of H. axyridis on C. juglandicola and P. juglandis under four different temperature regimes

From: Effect of temperature on predation by Harmonia axyridis (Pall.) (Coleoptera: Coccinellidae) on the walnut aphids Chromaphis juglandicola Kalt. and Panaphis juglandis (Goeze)

Aphids Temp. (°C) Attacking efficiency (a) Handling time Th (d) Predation capacity a/Th Maximum predation number 1/Th Holling’s type II equation R2
C. juglandicola 15 0.7944 0.0031 256.2604 322.5806 Na = 0.7944N/(1 + 0.0025N) 0.8756
20 0.9169 0.0021 434.5543 473.9336 Na = 0.9169N/(1 + 0.0019N) 0.9821
25 1.0158 0.0020 495.5050 487.8049 Na = 1.0158N/(1 + 0.0021N) 0.9964
30 1.0862 0.0019 565.7481 520.8333 Na = 1.0862N/(1 + 0.0021N) 0.9923
P. juglandis 15 0.5798 0.0075 77.2065 133.1558 Na = 0.5798N/(1 + 0.0044N) 0.9641
20 0.8034 0.0042 189.4811 235.8491 Na = 0.8034N/(1 + 0.0034N) 0.9969
25 0.8386 0.0035 236.8973 282.4859 Na = 0.8386N/(1 + 0.0030N) 0.9978
30 0.8468 0.0029 293.0194 346.0208 Na = 0.8468N/(1 + 0.0024N) 0.9923