UJI TOKSISITAS BEBERAPA GULMA SEBAGAI PESTISIDA NABATI HAMA BUBUK PADA PENYIMPANAN BENIH JAGUNG

Abstract

The characteristic of seed corn is short longevity either stored in warehouses or other storages, because it is easily attacked by maize weevils. Besides causing of seed damages and weight losses, attack of this pest also caused a decrease in quality of seed corn. This research aimed to determine the level of bioactivity of some kind of weeds on corn maize weevil pests in an effort to maintain the quality of corn seed during the storage. The research was arranged in completely randomized design (CRD) with 25 treatments and 4 replications. The treatment consisted of botanical pesticides from ringworm cassia (Cassia alata), kogon grass (Imperata cylindrica), sensitive plant (Mimosa pudica), purple nutsedge (Cyperus rotundus), garden spurge (Euphorbia hirta), common lantana (Lantana camara), goatweed (Ageratum conyzoides) and Eupatorium odorata with concentration respectively 2, 4, and 6%. The results showed that application of powder formulation botanical pesticides from various of weed material did not influence seed viability of corn after storage for 3 months with initial moisture content at 9.48% and did not cause differences in population density of both maize weevil Sitophilus spp. and Tribolium confusum. Applications of botanical pesticide made from material of sensitive plant-4%, garden spurge-2%, common lantana-6% and goatweed-2% showed zero pest population or there are no maize weevil at all, although not significantly different from the control or another treatments . Key words: toxicity, seed corn, maize weevil, botanical pesticides