Tharsini Puvaneswararajah

No. Common name Botanical name 22 Caesarweed Urena lobata 23 Purple-leaved button weed Borreria ocymoides 24 Three-flowered beggar weed Desmodium triflorum 25 Asthma plant Euphorbia hirta 26 Devil’s horsewhip Achyranthes aspera 27 Common tephrosia Tephrosia purpurea 28 Wandering jew Commelina benghalensis 29 Dwarf copperleaf Alternanthera sessilis 30 Red spiderling Boerhavia diffusa 31 Hurricane weed Phyllanthus amarus 32 Black pigweed Trianthema portulacastrum 33 Hairy indigo Indigofera hirsuta 34 Ceylon slitwort Leucas zeylanica 35 Giant sensitive tree Mimosa ...

Physical Methods Covering Manual remove Tillage Thermal methods Cutting Cultural Methods Stale seedbed Buried drip irrigation Crop rotation Plant density Correct fertilizer application Use better cropping system Biological Methods Specially used for aquatic weeds. Biological agents such as pathogens and other animals reduce or kill the infected weeds. Chemical Methods Organic approaches Organic weed control involves anything other than applying manufactured chemicals. Typically a combination of methods are used to achieve satisfactory control. Herbicides However, weed control can also be achieved by the use of herbicides. Selective herbicides kill certain targets while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the week and are often based on plant hormones. Herbicides are generally classified as follows: Control herbicides Systemic herbicides Soil born herbicides Pre-emerged ...