Evaluation of six different groups of insecticides for the control of citrus psylla Diaphorina citri (Hemiptera: Psyllidae)

Abstract

Studies on the efficacy of different insecticides against citrus psylla, Diaphorina citri (Hemiptera: Psyllidae) were carried out at Agricultural Research Institute, Tarnab, Peshawar, Pakistan. Six insecticides viz. Actara 25 WG, (thiamethoxam) Cascade 10 DC (Flufenoxuron), Match 050 EC (lufenuron), Thiodan 35 EC (endosulfan), Karate 2.5 EC (α-cyhalothrin), and Supracide 40 EC (methidathion), were tested for their effectiveness against D. citri. After first spray overall mean population of D. citri was 3.63, 4.75, 5.59, 6.66, 7.47, 8.11 per six inches tender shoot on Actara 25 WG, Cascade 10 DC, Match 050 EC, Thiodan 35 EC, Karate 2.5 EC and Supracide 40 EC treated plants respectively, while on control plants the population was 12.39. Similarly, after the second spray of each of the same insecticides the population of D. citri was 2.65, 4.23, 5.61, 6.41, 7.35 and 8.73 respectively. Where in controls there were 15.18 psyllids. Percent decrease of D. citri population in comparison to control after the first spray was highest in Actara 25 WG (72.20) followed by Cascade 10 DC (62.91), Match 050 EC (54.07), Thiodan 35 EC (47.61), Karate 2.5 EC (38.94) and Supracide 40 EC (35.74). After the second spray percent decrease over control recorded was highest in Actara 25 WG (83.54), followed by Cascade 10 DC (71.08), Match 050 EC (63.94), Thiodan 35 EC (60.79), Karate 2.5 EC (52.52) and Supracide 40 EC (45.62).

Keywords

• citrus psylla
• citrus
• insecticides