Apple cultivars acceptance by Dysaphis plantaginea Passerini (Homoptera: Aphididae) |
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| Authors: | G Angeli S Simoni |
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| Institution: | (1) Plant Protection Research Unit, Research Center Istituto Agrario S. Michele, 38010, San Michele a/Adige, Trento, Italy;(2) Istituto Sperimentale Zoologia Agraria, via di Lanciola 12/a, 50125 Firenze, Italy |
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| Abstract: | The development time, longevity, and fecundity of Dysaphis plantaginea were measured on six apple cultivars (Golden delicious, Red delicious, Renetta canada, Florina querina, Golden lasa, and Golden orange) under controlled conditions, in order to establish the life tables of D. plantaginea on the different cultivars and to evaluate the tolerance of the cultivars against this pest. The intrinsic rates of increase (r
m) were 0.07 and 0.11 day−1 on F. querina and G. orange, respectively. On the other four cultivars, rates ranged between 0.22 and 0.26 day−1, with the maximum value registered on G. lasa. All the biological and demographic parameters evaluated, i.e. survival of larvae (M = 5.8–72.2%), mean generation time (T = 14.94–20.62 days), and net reproduction rate (R
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= 4.23–47.37), show that G. orange and F. querina are tolerant cultivars while R. delicious, R. canada, G. lasa, and G. delicious are susceptible hosts. |
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| Keywords: | Apple cultivars Dysaphis plantaginea Demographic parameters Life table Tolerant cultivars |
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