Weed Hosts for Onion Thrips (Thysanoptera: Thripidae) and Their Potential Role in the Epidemiology of <I>Iris Yellow Spot Virus</I> in an Onion Ecosystem

Potential factors contributing to the decline of Iris Yellow Spot Virus in organically grown onion crops in Canterbury and Hawke's Bay over three years

“…The host plant range for IYSV is more limited than that of onion thrips, with only 47 species listed world-wide (Gent et al 2006;Smith et al 2011). Of these, 15 species are found as common weeds or crop plants in New Zealand (Popay et al 2010).…”

“…However, recent research has shown the virus can be transmitted less efficiently by Frankliniella fusca, a thrips species not present in New Zealand (Srinivasan et al 2012). Unlike other tospoviruses, IYSV has a relatively narrow host plant range (Gent et al 2006;Smith et al 2011). Infection by IYSV also tends to be localised, whereas other tosposviruses cause systemic infection (Smith et al 2006).…”

Relationships between insect predator populations and their prey, Thrips tabaci, in onion fields grown in large-scale and small-scale cropping systems

“…Transplanted onions in these insecticide-free plots were protected from onion maggot (Delia antiqua [Meigen]) by dipping the lower half of each plant in a solution of spinetoram (Radiant SC, Dow AgroSciences, Indianapolis, IN) and water at a rate of 60 ml of product per 3.8 l of water. This practice only protects the onion crop from maggots early in the season and does not impact the timing of T. tabaci colonization (unpublished results), which does not begin until June (Smith et al 2011). No foliar insecticides were applied to these plots throughout the season, thus plots were considered ''insecticide-free''.…”

“…To assess predator abundance (larvae or nymphs and adults) and T. tabaci abundance (larvae only), growermanaged fields and insecticide-free plots were sampled before T. tabaci colonization of onion fields (Smith et al 2011) until harvest. Sampling in 2011 began on 31 May and continued weekly until 1 September.…”

Hospedantes alternos de Iris yellow spot virus y trips en cultivos de cebolla de Morelos y Michoacán, México

“…Sequencing indicated identity with Thrips tabaci with a homology greater than Onion is a highly economically important crop in Mexico, and it can be affected by several diseases, including those caused by a virus that cause considerable losses and are difficult to handle. The Iris yellow spot virus (IYSV) of the Tospovirus genus, causal agent of the disease known as white spot in onion, is one of the most important viruses in plants of the genus Allium (Brewster, 2008), due to its wide geographical distribution and range of hosts (Ghotbi et al, 2005;Sampangi and Mohan, 2007;Smith et al, 2011). In Mexico its presence has been reported in the states of Zacatecas (Velásquez-Valle and RevelesHernández, 2011) and Morelos in onion plantations (Ramírez-Rojas et al, 2016), and in Guanajuato, in garlic plantations (Pérez-Moreno et al, 2010).…”