Comparison the Effect Insecticide of the Oils of Six Plant Extracts on the Aphids in Alfalfa Green

Abstract

The green alfalfa is the culture more used as livestock feed in the Ziz Tafilalt region in the south-east of Morocco. But the large aphid pest caused major damage to this culture, which pushes the peasants to use of synthetic insecticides in great quantity during the period of spring and the summer. The major problem in the production of alfalfa is the infestation by aphids. They transmit viruses of the tile to the plants. They are more likely to be a danger in the cool weather. The study presents the effects of products Kanuka, Ravintsara, Tea tree on the one hand and of products Thyme, Oregano, Neem on the other hand on the aphids of green alfalfa.The tests were conducted of the months from May to September on the aphids of the alfalfa fields green. It determines the percentage of deaths of aphids in function of the dose 1% and 5% of these products and the time 3, 7 and 11 hours after treatment. A comparison between the results obtained showed that the Oregano products followed by the Neem and thyme are more active.

Keywords: alfalfa, insecticide, aphid, kanuka, ravintsara, tea tree, oregano, thyme, neem