Seasonal Occurrence of Yellow Tea Thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) in Citrus Orchards and Its Damage Symptoms on Citrus Fruits

Abstract

Silver-grey or dark brown scaring, or dark brown discolored damages caused by the yellow tea thrip, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) have occurred on citrus fruits cultivated in the open field in east-south area orchards of Jeju Island since 2007. The weekly population of yellow tea thrips adults caught with a yellow sticky trap increased gradually from early May and peaked in late August, 2009. In 2010 and 2011, the most population was in early October. The yellow tea thrips of some species usually dominated from July in open citrus fields, and seven generations, at least, had occurred from May to late October 2009 by a yellow sticky trap survey. In 2009, S. dorsalis larva were observed from July and with peaks from late August to mid September and early October on citrus fruits. The damage symptoms appeared in the mid September. In 2011, the population peaks were in early July and late September, and the symptoms increased continually from mid July to late October. The symptoms were silver-scars or initial dark discolorations and then gradually changed to dark-brown discolorations or dark-brown scars. The percent of damaged fruits were 0.9%, 0.4%, 0.8% and 2.7% in 2008, 2009, 2010 and 2011, respectively, by survey in 64 typical orchards in Jeju Island. We are the first to report symptoms of the yellow tea thrip (Scirtothrips dotsalis) on citrus fruits.

Estimating Bacterial Diversity inScirtothrips dorsalis(Thysanoptera: Thripidae) via Next Generation Sequencing

“…Chilli thrips Scirtothrips dorsalis is both a virus vector (Chu et al 2001; Meena et al 2005; Gopal et al 2010) and a pest of many crops around the world including tea (Saha & Mukhopadhyay 2013), mango (Aliakbarpour & Md. Rawi 2012; Choi et al 2013), roses (Hegde et al 2011; Mannion et al 2013), and citrus (Gao et al 2012; Hyun et al 2012). It is a highly polyphagous species, feeding on >100 plant species in 40 different families, many containing important U.S. crops (Hodges et al 2007; Kumar et al 2013).…”

Temperature-dependent fecundity of overwinteredScirtothrips dorsalis(Thysanoptera: Thripidae) and its oviposition model with field validation

“…Also, it was first recorded in citrus orchards on Jeju Island by the areawide survey of 1996–1998, without serious damage to citrus fruits. However, serious silver‐grey or dark‐brown scarring or dark‐brown‐discoloured damage caused by S. dorsalis has occurred on citrus fruits since 2007, resulting in a reduction in both citrus yield and fruit quality. S. dorsalis was previously reported to be a serious pest on Citrus (especially C. unshiu ) in Japan and Taiwan …”

Development of Molecular Marker to Detect Citrus Melanose Caused by Diaporthe citri from Citrus Melanose-like Symptoms

“…Yellow tea thrips, Scirtothrips dorsalis hood, and pink citrus rust mite, Aculops pelekassi keifer, are also serious insects in citrus orchards. Once these insects feed on the rind of fruits, their surfaces become dead, rusty, and black ( Childers and Achor, 1999 ; Hyun et al, 2012 ). Sunscald injury on fruits is caused by high temperature or high intensive solar radiation.…”