EVALUASI LAPANG TERHADAP DAMPAK APLIKASI INSEKTISIDA ISOPROCARB PADA SERANGGA PREDATOR DAN HAMA KUTU PERISAI AULACASPIS TEGALENSIS Zhnt. (HOMOPTERA: DIASPIDIDAE) DI PERTANAMAN TEBU

Field evaluation of isoprocarb insecticide-application-effects on predacious insects and scale pest Aulacaspis tegalensis Zhnt. (Homoptera: Diaspididae) in sugarcane plantations.  The sugarcane scale, Aulacaspis tegalensis Zehntner,  is a new  serious pest of sugarcane in Lampung Province.  Over the years, most control practices against A. tegalensis  rely on the use of chemical insecticide.  A  field  study was conducted to assess  the  impact of  isoprocarb (carbamate-insecticide) on sugarcane scale pests  and  their natural predators in sugarcane  plantation.  The results indicated  that the application of  isoprocarb  (at recommended  concentration = 1.25 mg/L) in sugarcane field failed to cause  a significant reduction on  scale pest  populations.  In contrast, the numbers of  predacious insects was significantly reduced  in isoprocarb-treated-field plots.     The  predacious insects  in association with scale pests in sugarcane fields were predominantly  coccinellids.  Four species of primary predacious coccinellids attacking scale pests were: Chilocorus melanophthalmus, Chilocorus sp.,  Scymnus sp, and Telsimia sp.  This field study indicated that the predacious species were more susceptible to isoprocarb than their prey.