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Table 1 Estimates of the parameters P0, P1, P2 and P3 of the proportion of D. echinocacti host parasitized by P. diaspidis and A. debachi

From: Potential of parasitoids to control Diaspis echinocacti (Bouché) (Hemiptera: Diaspididae) on Opuntia spp. cactus pear

Parasitoid

Parameter

Estimate

SE

t-test

P value

P. diaspidis

P0

0.991

0.075

13.297

P < 0.0001

P1

− 0.013*

0.003

− 4.816

P < 0.0001

P2

− 0.034

0.010

− 3.357

P = 0.001

P3

− 0.104

0.024

− 4.400

P < 0.0001

A. debachi

P0

0.746

0.048

15.400

P < 0.0001

P1

− 0.007*

0.002

− 4.158

P < 0.0001

P2

− 0.016

0.007

− 2.362

P = 0.021

P3

− 0.064

0.016

− 4.123

P < 0.0001

  1. *A significant negative value for the parameter P1 indicates that the slope of the functional response curve is declining, thus a type II functional response