Significance of Weed Flora Identification and its Management on Bt Cotton (Gossypium hirsutum L.) Growing Tract of Tungabhadra Command Area

Aims: To identify the weed species in Bt cotton under Tunga-bhadra project command area and to study effect of sequential application pre- emergent (PE) post- herbicides (PoE) on growth know efficiency different control practices species.
 Study Design: The experiment was laid RBD (Randomized Block Design).
 Place Duration Study: conducted at ICAR- Krishi Vigyan Kendra farm, UAS, Raichur situated TBP during kharif season 2018-19.
 Methodology: design with 11 treatments replicated thrice. Gross plot size field 7.2 m × 4.8 net 5.4 ×3.6 spacing 90 x 30 cm. certified seeds Jadoo II Cotton test weight 6.5 g used for sowing. crop duration around 6 month
 Results: Weed flora present were identified classified based their morphology. It divulged that; dicotyledonous weeds dominant field. applications metolachlor 50 % EC @ 1000 a.i. ha-1 as PE fb pyrithiobac sodium 10 125 PoE 2-5 leaf stage Inter cultivation (IC) 60 DAS reported lower count dry matter highest (90.22 %) harvest than diuron 80 WP 1500 pendimethalin Pendimethalin 1250 followed by DAS.
 Conclusion: Application pre-emergent post early later flush weeds. avoids emergence broad spectrum flushes shift. Integrated herbicidal along intercultural operations found better keeping a threshold following single method.