Chemical management of broad leaved weeds in grapes.

Abstract

Grape (Vitis vinifera L.) is one of the most important fruit crops temperate zone, which has acclimatized to sub-tropical and tropical agro climatic conditions prevailing in the Indian sub-continent. In India, grape are grown under different soil and cultural conditions. Weed flora varies according to the climate and physio-chemical properties of the soil. Irrespective of the agro climatic conditions, Parthenium histophorous, Cynodon dactylon Cyperus rotundus are the common weeds in the Indian vineyards although as many as 378 species of weeds have been reported to infest the cultivated lands in Karnataka (Krishna Sastry et.al. 1980). The weed flora also differ with the training and irrigation system of the vineyards. The variety of weeds and their intensity is more in vineyards where vines are trained to vertical trellises such as T, V, Y or tatura due to availability of uninterrupted sunlight. Under drip-irrigation system, weeds grow mainly in the wetted area particularly during summer (Patil 2005) (16).