Comparative life table analysis of some populations of two-spotted spider mite in semi-northern of Iran.
Paper ID : 1169-IPCA4 (R1)
Maryam Rezaie *1, Reza JavanNezhad2
1Zoology department
2Shahid Sattari Aeronautical University,
The two–spotted spider mite Tetranychus urticae is one of the most important agricultural pests globally infesting a wide range of plant families including economically important crops ranging from field and greenhouse vegetables and ornamentals to fruit trees and vines. An investigation was carried out to study the developmental time, reproduction and life table of five populations at the laboratory conditions (at 27°C, 60% RH and 16: 8 h L: D) on the strawberry leaves (Gavita cultivar). The different populations were selected from orchards in some northern provinces (West Azerbaijan, Tehran, Mazandaran and Khorasan Razavi).The age-specific life table of five populations (Azarbijan, Dashtnase, Faryman, Razkan and Tehran strain) of T. urticae was investigated. The variance and standard error of population growth parameters were estimated by the bootstrape procedure. There were significant differences in developmental time among these populations for the egg, larvae, pronymph and deutonymph. More than 68% of eggs of five populations of T. urticae (ranged 68% -88%) hatched. The total immature mortality of T. urticae ranged from 37% to 64%. The male and female longevity were significantly different. The life time longevity of Faryman and Dashtnase populations were different from Razkan population. Total fecundity of Azarbijan population (25.78± 8.72), Razkan population (24.41± 9.41) and Tehran population (27.0±7.08) were higher than that observed for the other populations. The highest R0 of T. urticae was in Azarbijan and Dashtnase populations and the lowest in Faryman population. The rm values of Azarbijan population (0.200 day-1) and Dashtnase population (0.248 day-1) were significantly different from the values of Faryman population (0.124 day-1). The individuals of Azarbijan and Dashtnase populations had the highest intrinsic rate of increase. The biological variation of the two-spotted spider mite collected on fruit trees from several localities was showed the relative role of ecological factors (host plant) and geographical distance.
Tetranychus urticae, population, age-specific life table, fecundity, longevity
Status : Abstract Accepted (Poster Presentation)