On avocados, thrips can cause brown or silver scarring on the fruit. Plants were sampled primarily while in flower. TSWV has a very wide host range, and the only thrips that transmits the virus in a persistent way. Management. Western flower thrips (WFT), Frankliniella occidentalis (Pergande), forms a key agri‐ and horticultural pest worldwide. Onion thrips (Thrips tabaci), top, and western flower thrips (Frankliniella occidentalis), bottom are typical thrips, none to easy to tell apar! α-Ionone decreased the number of eggs laid by female thrips on wild-type leaves (Figure 4; p < 0.005, t = 2.56, df = 18). Female adult western flower thrips of different age were randomly collected with a small aspi- Western flower thrips host plants include digitalis, tanacetums, lobelias, verbascums, stachys, and achilleas. Western flower thrips (Frankliniella occidentalis) develops from an active larval stage through to a non‐feeding, almost immobile, pre‐pupal and pupal stage. Western flower thrips, Frankliniella occidentalis P. (Thysanoptera: Thripidae) is a major agricultural and horticulture pest worldwide (Kirk, 2002; Kirk and Terry, 2003).It causes damage and spoilage to a vast number of economically important plant species through feeding, oviposition and spread of several plant diseases, most notably tospoviruses (Morse and Hoddle, 2006). As these parts of the plant grow, they can become severely deformed. Thrips palmi was first described by H. Karny in 1925 from specimens collected in 1921 on tobacco in Sumatra. Western flower thrips attack a wide range of plants including: carnations, chrysanthemums, corn, cotton, cucumbers, eggplants, gerberas, grapes, impatiens, melons, peaches, peanuts, peas, and peppers. Western flower thrips has a host range of hundreds of plant species, including many major commercial floriculture crops. We confirmed whether α-ionone is effective for the combination of Arabidopsis and western flower thrips by releasing adult female thrips onto the leaf surface of wild-type (Col-0) plants that were treated with 300 μM α-ionone. Both viruses affect a wide range of plants, and often a single host plant may be infected by both viruses. The egg is cylindrical and slightly kidney shaped. Volatiles collected by entrainment of a solvent extract of F. ulmaria were more attractive than was the original extract. The second most abundant predators were spiders (Araneae). Western flower thrips, the primary thrips species encountered by greenhouse producers, is extremely polyphagous, feeding on a wide-variety of horticultural crops grown in both commercial and research greenhouses. One hundred thirty species of native and introduced plants growing in uncultivated land adjacent to apple and pear orchards of central Washington and northern Oregon were sampled for the presence of the western flower thrips (WFT) Frankliniella occidentalis (Pergande, 1895) and potential thrips predators. The number of WFT on non-flowering plants was significantly lower than on flowering plants or single cut flowers. Distribution and host range. On leaves thrips can ingest the cell contents of Photo: Thrips: www.gardentech.com Thrips are tiny insects that are mainly active at night. The western flower thrips [Frankliniella occidentalis (Pergande)] is an invasive pest insect in agriculture. Based on pesticide resistance studies, western flower thrips has various metabolic detoxification enzyme systems that could help it to overcome secondary plant defenses (Jensen 2000; Espinosa et al. occidentaliswas main-tained on potted, flowering plants of the susceptible chrysanthemum cultivar Sunny Cassa in a greenhouse at258 C and70% relative humidity. Carnations, chrysanthemums, gerberas, geraniums, marigolds, pansies, and roses are the major host plants. Western flower thrips will … Host plant resistance to western flower thrips (WFT) in chrysanthemum was studied in several stages of plant development. Western Flower Thrips John P. Sanderson Introduction. 117) and melon thrips (see Fact Sheet no. Host Plants: This thrips feeds on almost any flowering plant. An infestation of Western Flower Thrips (WFT), Frankliniella occidentalis (Pergande), recently developed on young citrus trees in a greenhouse devoted to rearing Asian citrus psyllid (ACP), Diaphorina citri Kuwayama. 1 INTRODUCTION. Onion thrips and western flower thrips are found widely throughout New Zealand on a broad range of crops. Western flower thrips (WFT), Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) is a native insect of the western part of North America that was first reported in 1895.In the 1970s and early 1980s, this species spread throughout North America (Beshear 1983). Introduction . This generally occurs in the compost or soil below the plant on which the larvae fed. 2005). Western flower thrips have a broad host range of more than 500 species in 50 plant families and are associated with many cultivated crops and ornamentals. The western flower thrips (Frankliniella occidentalis) is the most important vector for both tomato spotted wilt virus (TSWV) and impatiens necrotic spot virus (INSV). As a result, you typically see the damage they cause well before seeing the insects themselves. To avoid misunderstand-ings and misinterpretations, it is clear that the term “host plant” must be applied in the proper context. It was collected on 64 plant species, all of which were hosts for WFT. WFT damage plants directly by feeding, and indirectly by acting as vectors for the tospoviruses impatiens necrotic spot virus (INSV) and tomato spotted wilt virus (TSWV). This cosmopolitan and polyphagous invader is abundant in many field and greenhouse crops. Large numbers of young flush leaves were killed which negatively impacted ACP, as ACP is dependent on flush for oviposition and nymph development. The behavioural responses of adult female western flower thrips, Frankliniella occidentalis (Pergande) to volatiles from meadow-sweet (Filipendula ulmaria), bay laurel (Laurus nobilis) and sage (Salvia officinalis) were investigated in laboratory bioassays. Unfortunately, there is little basic ecophysiology information on the response of western flower thrips to host plant chemistry. Onion thrips is a key pest of onions, but will also attack the young growth of capsicum, cucumbers and the flowers of some flower crops. Abstract. Feeding by these tiny insects causes plant cells to collapse, which may eventually result in distorted The western flower thrips (Frankliniella occidentalis) is the most important vector for both tomato spotted wilt virus (TSWV) and impatiens necrotic spot virus (INSV). Crops attacked by this pest include beans, burdock (gobo), capsicum, cucumber, eggplant, lettuce, onion, tomatoes and watermelon. The objective of this study was to investigate quantitative host plant resistance to thrips in carrot and to identify candidate compounds for constitutive resistance. Western flower thrips, Frankliniella occidentalis, feeds in a piercing sucking manner and is a worldwide pest on many ornamental and vegetable crops. western flower thrips, Frankliniella occidentalis (Pergande), one of the most destructive insect pests of greenhouse-grown crops. Scarring on avocados. Western flower thrips also vector some potentially devastating diseases, such as Impatiens necrotic spot virus or Tomato spotted wilt virus . Several species of thrips can infest greenhouse floral crops, but the most severe and common pest in recent years has been the western flower thrips (WFT), Frankliniella occidentalis. to select for host plant resistance or tolerance . Successful IPM programmes for management of western flower thrips (WFT), Frankliniella occidentalis, on UK strawberry crops have been developed using knowledge of its biology and behaviour (Bennison Both viruses affect a wide range of plants, and often a single host plant may be infected by both viruses. Plant length and leaf area of non-flowering Dendranthema grandiflora Tzvelev were reduced after WFT infestation, and these two variables were correlated. Other thrips will attach the following host plants - annual asters, dahlias, gladioluses, lilies, tuberous begonias and wax begonias. 106); however, the western flower thrips is the more important vector. This species of thrips is native to the Southwestern United States but has spread to other continents, including Europe, Australia (where it was identified in May 1993), and South America via transport of infested plant material. Small spider immatures (first and second instars) of several species were common on certain host plants, and are likely to feed on WFT. Heavily infested flower buds may not open at all, and fruit can be damaged, even with low thrips populations. The western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), is an important invasive pest that damages a range of horticultural and agronomic crops worldwide (Reitz 2009, Mouden et al. The platform was used to establish host-plant preference of thrips with a large plant population of 345 wild Arabidopsis accessions (the Arabidopsis HapMap population) and the method was optimized with two extreme accessions from this population that differed in resistance to thrips. Western flower thrips can damage flowers, such as roses, with petal discoloration as a result of thrips feeding. Damage includes feeding scars and leaf distortion (see Figures 9 and 10). 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