Invasive Species Compendium

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Abstract

Effectiveness of post-emergence herbicides in vineyards in Ostrov, Constanta.

Abstract

Because of their perenniality and the long distance between rows, the vineyards are yearly covered by perennial and annual mono and dicotyledonous weeds which are very difficult to fight against. Since workforce reducing occurred, chemical weed control has become a necessity as the weeds may compete with the vines for water and nutrient contents of the soil. The weeds may also support the development of diseases and pests and reduce the quality and quantity of grapes production. The research was conducted on the vineyard area of Ostrov-Dobrudja hills, on two different locations (the Canlia's and Lipnita's villages area) and was aimed at determining the efficacy of gluphosinate - based on herbicides applied in postemergency for weed control. Field studies were placed in four-repeated randomised complete blocks and the herbicides were applied at the rates of 3, 4 and 5 litters on hectare when the dicotyledonous weeds were on the active-growth stage (4-6 leaves) and the monodicotyledonous ones had 10-15 cm tall before twinning. Observations and determinations aimed at efficacy in weeds control compared to untreated plot and monitoring phytotoxicity effects on grapevines (yellowish, brownish, necrosis). In the experimental field the following weed species predominated: Sorghum halepense, Sonchus arvensis, Convulvulus arvensis, Agropyron repens and Amaranthus retlofexus. There were also found other weeds: Chenopodium album, Portulaca oleracea, Echinochloa crus-galli, Setaria glauca and S. viridis, but with a lower density. The results obtained demostrated that gluphosinate-based on herbicides provided good efficacy in mono and dicotyledonous weeds control from Ostrovit's vineyard area. The best result was obtained at the rate of 5 l/ha. The invasive species Sorghum halepense is not completely controlled at the rate of 3 and 4 l/ha. No phytotoxicity symptoms have been shown on the researched varieties (Muscat-Ottonel and Feteasca Regala).