Abstract:
Onion thrips Thrips tabaci is the principal pest of economic importance
attacking onion in most growing areas, damage in the Sudan may reach 40%.
This experiment was conducted at Shambat Research Station, Agricultural
Research and Technology Corporation (Khartoum Bahari). During winter
season (2004/2005), to evaluate the performance of Nimbecidine
(Azadirachtin) 0.03% EC for the control of onion thrips T. tabaci.
Nimbecidine with four dosage rates was compared with Decis
(deltamethrin) 2.5% EC at recommended dose (2g a.i/fed) and untreated
control.
The experiment laid out in randomized complete block design with six
treatments with three replications. All cultural practices were adopted
according to Agricultural Research and Technology Corporation
recommendations.
The results indicated that Nimbecidine with all tested doses significantly
reduced the number of thrips populations compared with the untreated control.
The performance of Nimbecidine increased with dosage rates increased
and 1.5ml\litre was the most effective. Nimbecidine was less effective
compared with standard insecticide (Decis).
iii
.(Ton\ fed) compared with the untreated control
