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Becano 50 Sc-a Promising Pre-emergent Herbicide in Tea

M. Ali
CSO
Bangladesh Tea Research Institute, Srimanga-3210, Moulvibazar

M. M. R. Akonda
SO
Bangladesh Tea Research Institute, Srimanga-3210, Moulvibazar

M. S. Islam
SSO
Bangladesh Tea Research Institute, Srimanga-3210, Moulvibazar

R. M. Himel
SO
Bangladesh Tea Research Institute, Srimanga-3210, Moulvibazar

Abstract/ Executive Summary:

Two experiments were carried out at Bangladesh Tea Research Institute (BTRI) and Bilascherra experimental farm, BTRI with a new pre-emergent herbicide BecAno 50 SC to investigate the efficacy and suitability for controlling weeds in tea. It was applied both in nursery and in young tea fields containing sufficient soil moisture. The test herbicide was diluted in 400 L of water per hectare. Degree of weed control was recorded visually at monthly interval on 0%= no control and 100% = complete control basis. BecAno 50 SC @ 150, 200 and 250 ml ha^-¹ shown 100% weed control after 4 months of application and 90 to 100% control was recordedafter 6 months of application compared to untreated control. The standard Chinochlor 5G @ 20 kgh^-1 had shown 80% growth inhibition of weeds. Significant (P0.05)reduction (96%) in dry weight with BecAno 50 SC 150 ml ha-1 was assessed after 6 months of application. The results indicated that BecAno 50 SC @ 150, 200 and 250 ml ha^-¹ suppressed weeds more effectively up to 6 months in nursery as well as in young tea. No adverse effect was found on young tea but, mortality of cuttings and inhibition of seed germination were observed in primary beds. The herbicide BecAno 50 SC @ 150 ml ha-1 is recommended for tea plantation except nursery containing sufficient soil moisture to check the germination of weed complex.

Keywords: BecAno, Indaziflam, Pre-emergent, Tea complex.

Location: Bangladesh Tea Research Institute (BTRI Farm)

Start Date: 00-00-2013

End Date:

Program Area: Pest Management

Commodity: Herbicide, Tea

Objectives:

To test the suitability of BecAno 50 SC for managing weeds in nursery as well as in young tea sections.

Methodology:

Experiment 1: The nursery experiment was conducted at Bangladesh Tea Research Institute (BTRI Farm) in the year 2013. The treatments were, T0= Control, T1= BecAno 50 SC @ 50 ml, T2= BecAno 50 SC @ 100 ml, T3= BecAno 50 SC @ 150 ml, T4= BecAno 50 SC @ 200 ml, T5= BecAno 50 SC @ 250 ml and T6= Chinochlor 5G @ 20 Kg ha-1 mixed in 400 L of water. The treatments were applied on clean and weed free plots containing sufficient soil moisture. The size of each plot was 10 m2. Fifty nodal leaf cuttings of tea were planted and fifty tea seeds were sown in each plot after application. Each treatment was replicated three times following Randomized Complete Block Design. Intercultural operations and observations were made during the period of the experiment. Experiment 2: Field experiment was carried out with same treatments at Bilashcherra Experimental Farm, BTRI during the year 2013. The treatments were applied on weed free young tea (2 years of old) plots containing sufficient soil moisture. The size of each plot was 25 m2. The herbicide was diluted in 400 L of water per hectare. Each treatment was replicated three times following Randomized Complete Block Design. Further intercultural operations were made during the period of the experiment.In both the experiments, data was collected in terms of % germination of mixed weeds. The efficacy of the tested herbicide was assessed by visual rating on a 100 point scale with 0 as “no control” and 100 taken as “full control” (Ali and Islam, 2011). Adverse effects of BecAno 50 SC on tea seed germination, mortality rate of tea cuttings and phytotoxic effect (if any) on young teas were also recorded. Data collection was started from one month after spraying of the treatments in ordered to allow sufficient time for weeds to emerge. Observations were continued at monthly intervals. After six months of application, all the germinated weed species from each plot were carefully uprooted and separated first into broad-leaf weeds and grasses. The separated weeds were then identified into component species. The identified weeds were dried in open sunlight for 72 hrs for dry weight estimation. The recorded data were analyzed statistically.

Source of Information: Tea J. Bangladesh, 44: 26-32, 2015 ISSN: 0253-5483

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The result of the study indicated that BecAno 50 SC was a promising pre-emergence herbicide for weed control in tea plantations. It was suggested to spray in tea plantation having sufficient soil moisture one time perannum @ 150 ml /ha diluted in 400 L of water. It is not recommended to spray in nursery beds because of high mortality of cuttings and failure of seed germination.

Knowledge Management: Journal