Use of the insect growth regulators, nomolt and alsystin, for the control of the desert locust, schistocerca gregaria (forscal)
2006
Khalil, R.A., Plant Protection Directorate, Wad Medani (Sudan) | Taha, A.K., Plant Protection Directorate, Wad Medani (Sudan)
Nomolt (teflubenzuron) 50 UL and Alsystin (triflumuron) 50 UL, two insect growth regulators (IGRs), were tested against the desert locust (DL) Schistocerca gregaria (Forscal). A breeding site of desert locust south west Port Sudan of the Red Sea State was selected for the trial. Both insecticides were applied with the hand-held UL sprayer Micro Ulva at the speed of 2 km/hr with spray height of ca 0.5 m above the ground. The experiments were conducted twice; in the periods 12-25/11/2005 and 14-27/03/2006 and the results were compared with the control (i.e. the untreated insects). Mortality was recorded at zero time and then daily for 14 days. The most frequently observed abnormality in the dead and live insects were a soft incompletely hardened cuticle, often ruptured at the inter-segmental membranes, lose their legs before dying, wings buds deformation occurred in dead insects and showed a swelling between the pronotum and abdomen. Most of the insects ceased feeding after the second day. Moulting completely stopped after the third day. Insects became weak and subsequently less active. In the two trials, about 60% and 90% mortality occurred after the sixth and the tenth day, respectively for both chemicals. Nomolt 50 UL and Alsystin 50 UL at the three doses gave similar performance against the pest
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