Aphid-Transmission Efficiency of Two Main Viruses on Garlic in Egypt, Onion Yellow Dwarf Virus (OYDV-G) and Leek Yellow Stripe Virus (LYSV-G)

Abstract

Abstract: The efficiency of nine aphid species as vectors of both OYDV-G and LYSV-G was investigated. The Four Aphid species: M. persicae, A. craccivora, A. gosspii and A. pisum were the most effective vectors, with a transmission efficiency of; 66.7, 60.0, 33.3 and 8.30%, respectively, for OYDV-G and was 63.6, 40.0, 20.0 and 20%, respectively for LYSV-G. The other 5 species: D. sonchi, A. nerii, R. pad, R. miadis and S. graminum; gave from 7.6 to 14.3 % transmission of OYDV-G and from 8.3 to 18.2 % transmission for LYSV-G. Both OYDV-G and LYSV-G were transmitted in a high percentage from garlic to garlic and the wingless form of aphid was more efficient than the winged one Among the tested vectors, M. persicae was most efficient followed by A.craccivora and A. gossypii, while A. pisum was the least efficient. The highest percentage of OYDV-G recovery from garlic to Chinese garlic was 92%. M. persicae was able to acquire and transmit LYSV-G from garlic to Chinese and Baladi garlic at 65.2 & 32 %, respectively. Key words: OYDV-G LYSV-G Aphids vectors Garlic viruses * INTRODUCTION Largely varying symptom severity is known to result In Egypt, garlic is considered one of the main individual plants. On an average, 87 % of the infested vegetable crops. The most common garlic varieties plants in the field contained OYDV-G and 18 % contained cultivated in Egypt, are the Balady followed by the LYSV-G. OYDV-G was isolated and identified from