DEVELOPMENT OF PLANT EXTRACTS FOR POST-EMERGENT WEED CONTROL

Abstract

        This study aimed to develop weed extracts for post-emergent painted spurge control. A test to find the types of the extract controlling the painted spurge was proceeded through Completely Randomized Design (CRD) with 3 replications, consisting of 6 treatments including the use of aqueous extracts from 5 dry weed leaves, namely siam weed (Chromolaena odorata (L.) R.M.King & H.Rob.), wild spikenard (Hyptis suaveolens (L.) Poit.), praxelis (Praxelis clematidea R.M King & H. Rob.), little ironweed (Vernonia cinerea (L.) Less.) and wild caia (Cleome viscosa L.) with the ratio of 1:2 (dry weed leaves : distilled water: 1g : 2 ml) compared with no plant extract. The result showed that the dry praxelis leaves extract had the best control effect on the post-emergent painted spurge when considering plant height, fresh and dry weight of painted spurge and visual weed control efficacy.

        The test for the ratio of the praxelis leaf extract suitable for controlling the painted spurge was proceeded through the experiment planned by Completely Randomized Design (CRD) with 3 replications, consisting of 4 treatments of 1:3 and 1:4 of dry praxelis leaf extract ratios. Compared with the use of the dry praxelis leaf extracts, the 1:2 ratio and no plant extract, it was found that the use of 1:2 and 1:3 ratio of the dry praxelis leaf extracts gave no significant difference in plant height, fresh and dry weight of the painted spurge and efficacy to control painted spurge. Therefore, the praxelis appeared potential to make aqueous plant extracts for controlling the painted spurge at a ratio of 1:3.