Marigold Flower (Tagetes erecta L.) Crude Extract on Killing the Mealybug

Abstract

This research aimed to study the effect of aqueous crude extracts of Tagetes erectaL. flower on killing mealybug (Pseudococcus sp.) of sugar apple. Dried leaves were extracted by maceration method using distilled water as solvent. Filtered and adjusted the concentrations of crude extract to 12.5, 25.0, 37.5 and 50.0 volume percent (%v/v). After that, sprayed each crude extract concentration on mealybug compared with control. Then, observed the
mealybug mortality every 12 hours for 72 hours. The result showed that at 72 hours exposure, the concentration of aqueous crude extract displayed the high %mortality. Moreover, at the concentration; 12.5, 25.0, 37.5 and 50.0 volume percent displayed the %mortality were 34.07±7.80, 81.48±2.56,88.89±3.85 and 88.89±3.85, respectively. For the purpose that at the concentration; 25.0, 37.5 and 50 volume percent showed the %mortality significantly different
at confidence level is 95%. Furthermore, at 72hours, the lethal concentration; LC50 and LC70of aqueous crude extract were 15.38 and 23.38 volume percent, respectively. Therefore, this research is the base of local plant utilization to the highest benefiton killing mealybug and can alsosolve the agricultural problem.