Efficacy of foliar spray of important insecticides against the mango shoot gall psyllid, Apsylla cistellata Buckton (Homoptera : Psyllidae).
Monobrullah M., Singh R.
Author Affiliation: Department of Entomology and Agricultural Zoology, Rajendra Agricultural University, Pusa 848125, District Samastipur, Bihar, India.
Journal of Entomological Research 21 : 377-380
Abstract : In field studies conducted in mango orchards at Pusa, Bihar, India, during 1995-96, quinalphos 25 EC, phosalone 35 EC, phosphamidon 85 EC, methyl parathion [parathion-methyl] 50 EC, fenitrothion 50 EC, monocrotophos 36 EC, dichlorvos 100 EC, formothion 25 EC and dimethoate 30 EC were sprayed at 0.05% to evaluate their effectiveness against the mango shoot gall psyllid, Apsylla cistellata. All treatments were effective in reducing gall formation when sprayed three times at fortnightly intervals beginning the 2nd week of September. The lowest number of fully formed galls was found on mango trees treated with phosphamidon (6.4 galls/10 twigs) followed by parathion-methyl (7.1 galls/10 twigs), fenitrothion (7.3 galls/10 twigs) and monocrotophos (9.7 galls/10 twigs), whereas the highest number of galls was found following treatment with dichlorvos (17.5 galls/10 twigs). Only sprays of phosphamidon, monocrotophos, dimethoate, formothion and dichlorvos effectively reduced populations of nymphs during mid-November. Nymphal mortality was highest following treatment with phosphamidon (63.1%) followed by monocrotophos (58.8%), dimethoate (53.4%), formothion (40.4%) and dichlorvos (19.9%). The remaining treatments had low efficacy compared with the untreated control. The least effective insecticides were fenitrothion (9.9%) followed by phosalone (10.1%), parathion-methyl (10.4%) and quinalphos (10.8%), and pest populations tended to increase following treatment with these insecticides.