International Journal of Plant Protection

T. R. Shashidhar ¹, P. R. Dharmatti ², C. C. Angadi ³, B. N. Motagi ⁴, S. J. Prashanth ⁵

Affiliations
1 Department of Horticulture, National Seed Project, Seed Unit, University of Agricultural Sciences, Dharwad Karnataka, IN
2 Department of Horticulture, College of Agriculture, University of Agricultural Sciences, Dharwad Karnataka, IN
3 Karnataka State Department of Agriculture, Dharwad Karnataka, IN
4 Department of Plant Breeding, Seed Unit, University of Agricultural Sciences, Dharwad Karnataka, IN
5 Dr. P. Sadananda Maiya Centre for Food Science and Research,Bengaluru Karnataka, IN

Abstract

Field experiments were conducted on medium black soil to know the effect of different herbicides on growth and yield of garlic. The experiment was conducted with BLG-1 genotype. The experiment was laid out in Randomized Block Design with three replications having fifteen treatments each. The treatments consisted of six herbicides with two concentrations each along with two manual weeding treatments and an unweeded control. The cultural practices were practiced as per the package of practices of University of Agricultural Sciences, Dharwad. Significant differences were observed among the treatments for all the weed parameters at all the stages of observation. Among herbicides, chlorimuron @ 9 and 12 g a.i. ha-1 recorded the least population of weeds (7.39 and 8.20, respectively) and was followed by chlomazone @ 1.0 and 1.5 kg a.i. ha-1 (9.74 and 11.84, respectively). Application of chlorimuron @ 9 and 12 g a.i.ha-1 recorded the lowest fresh weight (14.94 and 15.98 g, respectively) and dry weight (3.38 and 2.49 g, respectively) of weeds and was followed by application of chlomazone @ 1.0 and 1.5 kg a.i. ha-1 (22.35 and 24.30 g of fresh weight and 4.56 and 5.70 g of dry weight, respectively). Yield of garlic bulbs varied significantly wherein application of Oxyfluorfen @ 0.10 g a.i. ha-1 resulted in the production of highest yield ( 37.08 q/ha) and was on par with the application of Pendimethalin @ 1.0 kg a.i. ha-1 (36.22 q/ha) followed by Oxyfluorfen @ 0.20 g a.i. ha-1 (32.91 q/ha) and Pendimethalin @ 1.5 kg a.i. ha-1 (31.31 q/ha). The lowest yield (14.79 q/ha) was recorded in the unweeded control.

Keywords

Weeds, Herbicides, Garlic

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P. R. Dharmatti ¹, Kavita M. Beeraganni ²

Affiliations
1 Department of Horticulture, College of Agriculture, University of Agricultural Sciences, Dharwad Karnataka, IN
2 Department of Agricultural Entomology, N.M. College of Agriculture, Navsari Agricultural University, Navsari Gujarat, IN

Abstract

An experiment was conducted at University of Agricultural Sciences, Dharwad, Karnataka, India during 2009-2010, 2010- 2011 and 2011- 2012 to find out the thrips population attacking onion sowing at different dates to determine the optimum date(s) of sowing. There were twelve transplants in 2009-2010, sixteen transplants in 2010-2011 and 2011- 2012. Results indicated that in 2009-10, November 1st transplanted seedlings had a peak population of onion thrips in protected (8.95 thrips/plant) as well as in unprotected plots (53.30 thips/plant). Where as in 2010-11 and 2011-12, December 1st transplanted seedlings had a peak population of thrips. i.e. 10.75 thrips/plant in protected plot and 55.49 thrips/plant in unprotected plant (2010-11) and 11.58 thrips/plant in protected plot and 57.83 thrips/plant in unprotected plant (2011-12). The seedlings transplanted in Rabi season had peak thrips population compared to Kharif season transplanting dates. Therefore, the findings of this work revealed that onion thrip in Dharwad, Karnataka breed from November 1st to January 1st with a peak in December.

Keywords

Onion, Onion Thrips, thrips Tabaci, Seasonal Incidence

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