Chemical Control of Mugwort (Artemisia vulgaris L.) in Greenhouse Condition

Subject Areas : Plant Protection

Marjan Diyanat ¹ ( College of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran )

Received: 2016-10-18 Accepted : 2017-11-18 Published : 2018-05-22

Keywords:

Abstract :

Mugwort, (Artemisia vulgaris L.,) is a rhizomatous perennial weed common in field grown nursery crops, landscape plantings, and turf grass. Greenhouse experiment was conducted based on a factorial in randomized completely block design in 2014. Mugwort rhizomes were collected around Karaj and were trimmed into 3 cm-long segments. Three of these Mugwort rhizome segments were planted in 20-cm-diameter pots containing sandy loam soil, with pH 7.5 and 0.9 % organic matter content. Experimental factors included type of herbicide at six levels (2,4-D, glufosinate, picloram, dicamba, glyphosate and clopyralid) and herbicide concentration at six level (0, 0.28, 0.56, 1.1, 2.2 and 1.1+1.1 ai ha-1). Results showed that shoot dry weight of Mugwort was 2.52, 1.57, 2.17, 2.22, 3.25 and 0.63 g at 4 weeks after treatment and 0.28, 0.2, 0.25, 0.25, 0.35 and 0.1 g  at 9 weeks after treatment with application of 2,4-D, clopyralid, dicamba, glyphosate, glufosinate and picloram, respectively. So long-term control of mugwort plants and rhizomes can be achieved with picloram at lower concentrations. This level of mugwort control is more than likely because of the greater persistence of picloram in the soil compared with other growth regulator–type herbicides. 2,4-D and glufosinate could not control this weed in long-term and extensive regrowth from underground rhizomes was observed 9 weeks after spraying. This suggests that inadequate concentrations of glufosinate reach the underground rhizomes of mugwort, resulting in immediate regrowth and unacceptable long-term mugwort control. Clopyralid, dicamba and glyphosate were moderately effective in controlling mugwort under greenhouse conditions, but re-growth occurred after all herbicide concentrations, but higher rates were needed for complete control.