DETERMINATION OF FAVORITE HOST FOR THREE SPECIES OF PISTACHIO PENTATOMID BUGS UNDER LABORATORY CONDITIONS
The pistachio green stink bugs Brachynema signatum, Acrosternum heegeri and Chroanta ornatula are the most important pentatomid bugs in the pistachio growing areas. In order to multiply host bugs and use their eggs to rear the eggs of parasitoid wasps (T. agriope & Psix sp.), it is necessary to have suitable laboratory hosts. At first, adults of green stink bugs are collected from nature. After obtaining the eggs, nymphs were reared on the Zygophyllum fabago, Peganum harmala, Helianthus annuus and Cynanchum aqutun fruits under laboratory conditions (28±1ºC, 65±5% RH and 16h L: 8h D). Then, developmental nymph period, rate of fatality of nymphs and adults, egg laying period and sum of eggs, were determined. The results showed that, the lowest nymph period and fatality percent of nymphs in A. heegeri, B. signatum and C. ornatulai are observed on C. aqutun fruits with 32.14%, 44.13% and 48.8% and 22.8, 25.4 and 27.2 day, respectively. The highest weight and size difference between the wild and first generation reared female belong to C. ornatula on P. harmala fruits with 0.018 g and 1.2 mm. The least weight and size difference related to B. signatum on C. aqutun fruits with 0.008 g and 0.5 mm. The lowest fatality of nymphs belong to A. heegeri on P. harmala and S. kali fruits with 6.65% and highest belonging to C. ornatula on the Z. fabago fruits with 9.98%. The highest oviposition period and egg laying belong to B. signatum on the C. aqutun fruits with 325 eggs and 32 days. Totally, the results indicated that B. signatum is the most suitable as a laboratory host and C. aqutun fruits are the suitable host plant for mass production of nymph stages and adults of the bugs.
Hashemi Rad, H. and Radjabi, GH. (2011). DETERMINATION OF FAVORITE HOST FOR THREE SPECIES OF PISTACHIO PENTATOMID BUGS UNDER LABORATORY CONDITIONS. Acta Hortic. 912, 765-769
pistachio pests, green stink bugs, egg parasitoids, swallow worth