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 theconcentration; 12.5, 25.0, 37.5 and 50.0 volume percent displayed the %mortality were34.07±7.80, 81.48±2.56,88.89±3.85 and 88.89±3.85, respectively. For the purpose that at theconcentration; 25.0, 37.5 and 50 volume percent showed the %mortality significantly differentat confidence level is 95%. Furthermore, at 72hours, the lethal concentration; LC50 and LC70ofaqueous crude extract were 15.38 and 23.38 volume percent, respectively. Therefore, thisresearch is the base of local plant utilization to the highest benefiton killing mealybug and canalsosolve the agricultural problem.