Onion thrips, Thrips tabaci Lindeman, is a worldwide pest of onion whose feeding damage and transmission of Iris yellow spot virus (IYSV) may reduce onion yields. Little is known about the seasonal dynamics of T. tabaci dispersal, the distance of dispersal, or the movement of thrips infected with IYSV during the onion-growing season. To address these questions, T. tabaci adults were collected u...

Hsu, C. L., Hoepting, C. A., Fuchs, M., Smith, E. A., and Nault, B. A. 2011. Sources of Iris yellow spot virus in New York. Plant Dis. 95:735-743. Iris yellow spot virus (IYSV) has been found consistently in commercial dry bulb onion fields throughout New York State since 2006. Yearly recurrence of IYSV may result from annual reintroductions of the virus or persistence of the virus in overwinte...

thrips tabaci is one of the most important pests causing serioues damages on onion s in iran despite several chemical sprayings. to assess the population density and damage of the thips on onion, improved sefid-e-khomein genotype along with seven other iranian cultivars of onoin were planted in a rcb design with four replications in two separate experiments (sprayed and non-spray ed ) in arak f...

the predatory bug orius niger wolff is an important predator of the onion thrips, thrips tabaci lindeman in the potato fields of ardabil region. in this study, preference for prey, predatory rate, body size, and some life history parameters of o. niger were studied on seven potato genotypes (including savalan, agria, morene, kondor, diamant, pi397082-2, and pi397097-2)infested to t. tabaciunder...

Onion thrips, Thrips tabaci Lindeman, colonization of onion fields may be influenced by bordering crop and non-crop habitats. Identifying habitats adjacent to onion fields associated with high T. tabaci infestations would be valuable for improving scouting efforts and management decisions. A 3-year study examined adult T. tabaci colonization patterns within onion fields early (June through earl...

Center rot of onion, caused by Pantoea ananatis, is an economically important disease in onion production Georgia and elsewhere the United States. Growers rely on frequent foliar applications bactericides and, some cases, plant defense inducers to manage this disease. However, regular prophylactic application these chemicals not cost-effective may be environmentally friendly. Thrips (Thrips tab...

onion thrips, thrips tabaci lindeman, is a broadly distributed pest that attacks a wide range of crops. to investigate the intra-specific morphometric variation and the genetic diversity of the species in iran, four populations from tobacco plus 18 populations from onion were studied in some 17 provinces of iran. morphological analysis, using principal components and canonical discriminant anal...

Onion thrips, Thrips tabaci Lindeman (Thysanoptera: Thripidae), is an important pest on onion and cabbage. Two reproductive modes--arrhenotoky and thelytoky--are found in this species and co-occur in the field. We compared life table traits between arrhenotokous and thelytokous T. tabaci on cabbage and onion. Experiments were conducted in cages to determine which reproductive mode is more compe...

An action threshold (AT) is one of the most important decision-making elements in integrated pest management. Unlike economic thresholds, ATs are not typically derived from an economic injury level model, but they are more commonly used. ATs may be identiÞed from research-based, pestÐcrop relationships, but they also may be based on experience. ATs may be adjusteddependingon, e.g.,weather andpl...

Thrips tabaci Lind. (Thysanoptera: Thripidae) is a key pest of onions worldwide. It causes both direct and indirect damage to onion crops, resulting in high yield losses. Today, the Integrated System Production Plant Protection requires growers use onion- thrips-resistant cultivars. has become apparent that improvement existing cultivars may not be sufficient, so it necessary search for desirab...