บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Influence of grain type on the susceptibility of different Sitophilus oryzae (L.) populations, obtained from different rearing media, to three diatomaceous earth formulations

Christos G. Athanassiou, Nickolas G. Kavallieratos, Basileios J. Vayias and Emmanouel C. Panoussakis

Journal of Stored Products Research, Volume 44, Issue 3, 2008, Pages 279-284

2008

บทคัดย่อ

Influence of grain type on the susceptibility of different Sitophilus oryzae (L.) populations, obtained from different rearing media, to three diatomaceous earth formulations

Bioassays were carried out to assess whether the commodity, from which adults of the rice weevil Sitophilus oryzae emerged, influences the insecticidal efficacy of three diatomaceous earth (DE) formulations: Protect-It™, PyriSec® and DEBBM. Protect-It™ is a DE formulation that contains 10% silica gel, while PyriSec® and DEBBM are enhanced DEs that contain natural pyrethrum and the plant extract bitterbarkomycin, respectively. The S. oryzae populations tested were reared o­n wheat, barley or maize and the susceptibility of each to the DE formulations was assessed o­n all three commodities. The DE application doses were: 500 ppm for Protect-It™ and PyriSec®; 150 and 75 ppm for DEBBM. Mortality of S. oryzae adults was counted 7 and 14 d after their exposure o­n the treated commodities. Bioassays were carried out at 25 °C and 55% r.h. Barley-reared S. oryzae were the most tolerant of all formulations and treated commodities, whereas maize-reared were the most susceptible o­nes. DE effectiveness was always lower in maize than in wheat or barley irrespective of the commodity from which the populations were obtained. Furthermore, Protect-It™ and PyriSec® were more effective than DEBBM in wheat or barley, but not in maize.