Efficacy of Mixtures of an Organophosphate Malathion and a Synthetic Pyrethroid Deltamethrin against Lesser Grain Borer, Rhyzopertha dominica *
2003; University of Punjab (new Campus); Volume: 35; Issue: 2 Linguagem: Inglês
ISSN
0030-9923
AutoresNighat S. Ali, Masnadi Munir, Syed Shahid Ali, Abdul Rauf Shakoori,
Tópico(s)Entomopathogenic Microorganisms in Pest Control
ResumoAdults of six strains of stored grain pest, Rhyzopertha dominica viz. Chichawatni (C), Karachi (K), Wazirabad (W), Sialkot (S), Lahore (L), and Multan (M) were treated with an organophosphate malathion, and a synthetic pyrethroid, deltamethrin (Decis), alone and in two different combinations. C strain was found to be most resistant to malathion (LC50, 115.50 ppm), whereas M strain was least resistant (LC50 12.40 ppm). On the other hand, M strain was most resistant to deltamethrin (LC50 10.55 ppm), whereas L strain was most susceptible (LC50 2.83 ppm). A mixture of malathion : deltamethrin (10:1) was most effective against K, S and M strain with LC50 of 4.71, 5.33 and 8.38 ppm, respectively, whereas mixture 10:1.5 and 9:2 was most effective against W strain (LC 50 4.52 and 3.13 ppm) and M strain (LC 50 8.25 and 5.27 ppm), respectively. R. dominica did not show any definite pattern of susceptibility to both types of mixtures. It is concluded that mixture 10:1 with LC50 ranging between 4.53 to 24.94 ppm, mixture 10:1.5 with LC50 ranging between 4.52 to 8.74 ppm and mixture 9:2 with LC50 ranging between 3.13 to 61.53 ppm were found to be most effective for almost all the strains.
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