1 CHOREUTIS NEMORANA (HÜBNER, 1799) (LEPIDOPTERA: CHOREUTIDAE) –FIRST
2 RECORD IN BULGARIA
3 Tanya Todorova Vaneva-Gancheva
4 Tobacco and Tobacco Products Institute - Plovdiv
5 Abstract: Choreutis nemorana was found on Ficus carica in Plovdiv region, Bulgaria in
6 2016. This is the first record reported from Bulgaria. Distribution data, morphological, biological
7 data and life history of the species are presented.
8 Key words : Choreutis nemorana ; Ficus carica , Bulgaria
9
10 INTRODUCTION
11 On 30 September 2016, a damaged fig tree ( Ficus carica L.) was noticed in Plovdiv
12 region. The leaves looked skeletonized and whitened even from a distance. On the skeletonized
13 leaves some caterpillars, pupae in white cocoons and many empty pupae in cocoons were
14 remarked. We took some caterpillars and cocoons and kept them in the lab. Two larval
15 specimens which pupated on 2 October emerged on 20 and 23 October respectively. The moth
16 from pupa emerged between 15 and 19 October. This year (2017) at the end of summer on the
17 same fig tree and on two others nearby were observed the same damage. The moths emerged in
18 the end of October. It is the most likely that those moths are from second generation. Probably
19 damages from the first generation were minor and stay unremarkable. The only species that has
20 larvae specialized in eating the leaf tissue on a fig tree is Choreutis nemorana (Hübner, 1799),
21 which is not listed in Bulgaria, this appears to be the first report of this species.
22
23 DISTRIBUTION
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24 C. nemorana (Hübner, 1799) also known as a fig leaf roller or fig-tree skeletonize moth.
25 The species was described by Hübner, 1799. Synonym name is Tortrix nemorana Hübner, 1799.
26 This species is commonly distributed wherever there are Ficus carica trees - the Mediterranean
27 area, Canary Islands and Madeira, N. W. Africa, Asia Minor, Iran, the Caucasus, Georgia,
28 Azerbaijan, Armenia and Uzbekistan (Diakonoff, 1986). C. nemorana has also been recorded
29 from Albania, Austria, Belgium, Bosnia and Herzegovina, Croatia, Cyprus, France (incl.
30 Corsica), Germany, Gibraltar, Greece (incl. Aegean Islands, Crete, Dodecanese Islands),
31 Hungary, Italy (incl. Sardinia and Sicily), FYRMacedonia, Malta, Portugal, Romania, Spain
32 (incl. Balearic Islands), Switzerland, Turkey, and Ukraine (incl. Crimea) (De Prins, De Prins,
33 2014). The pest has expanded its distribution since 2005-2006 to the northern countries where
34 the F. carica is planted for ornamental purposes. The first northern record was reported from
35 Austria in 2004 (Embacher et al., 2004; Fauster, 2016), then from Germany in 2006 (Bryner,
36 2007; Gaedike, 2008), Switzerland in 2008 (Christian et al. 2008), Belgium in 2009 (De Prins et
37 al., 2009), Hungary in 2012 (Fazekas, 2015; Szaboky, 2015). The recent records are from British
38 Island in 2014 (De Prins, De Prins 2014), the Netherlands in 2014 (Vosser, 2015) and Slovakia
39 in 2015 (Lendel, 2017). The most northerly latitude where the C. nemorana was found is London
40 51.3031N 0.0949W (De Prins, De Prins 2014). The presence of the species in these areas likely
41 confirms the assumption of potential changes in distribution of the moth related to global
42 warming.
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44 DAMAGE
45 C. nemorana exclusively associated with F. carica and is a leaf tissue feeder (Mifsud et
46 al., 2012). Fig moth is considered a minor pest on F. carica that attacks almost exclusively to the
47 abandoned fig trees. It is rarely being detected in the fig crops. Nevertheless C. nemorana can
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48 also be a destructive pest of fig tree as it is in Guilan province Iran (Chitgar et al., 2014) and in
49 Tunisia (Zouba, 2010). The damage is caused by the larva (caterpillar). The young caterpillar
50 eats upper parenchymal cells but leaves the underside of the leaf untouched. It is protected by a
51 web of silken threads. Later larval instars feed on upper and under parenchymal cells leaving the
52 veins intact, where the pest name is skeletonized moth. They often turn down a leaf’s edge and
53 feed under this shelter (Fig. 1). Mature larvae pupate on the upper side of the leaf in a white
54 silken cocoon. The larvae can cause distortion, discoloration of the leaves and even extensive
55 defoliation. At times of severe infestation the damage on fig leaves may significantly reduce
56 photosynthesis, which can lead to significant losses (Chitgar et al., 2014).
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58 MORPHOLOGY
59 The adult insect is a small moth that has a wingspan 16-20 mm (Fig. 2). The body is
60 coloured in light grayish on the ventral part to brown on the dorsal part. The head is light
61 grayish. The forewings are almost square, have mainly an orange-brownish ground colour with a
62 very narrow silver-grey transverse line and a rather broad postdiscal transverse band of the same
63 colour. The hindwing is brown and has some yellowish to golden spots in the discal area and
64 along the margin. Eggs are spherical, cream white colour, 0.5 mm in diameter. Larvae are light
65 green with numerous black verrucae on thorax and abdominal segments; the head is yellowish
66 brown marked with black (Fig 3). Fully grown larvae are 15 mm long. The pupa is dark brown,
67 and 6-7 mm long. The cremaster is formed from two hard thorns sub dorsal located with a
68 crooked tip like a hook (Fig. 4).
69 BIOLOGY
70 Overwintered moths appear in the early spring and deposit eggs on the upperside of the
71 leaves. Larvae feed and grow for a few weeks and then pupate. The adults from first generation
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72 emerge in July–August. The moths of the second generation flight in September–October. The
73 adults of this autumn generation hibernate in plant debris.
74
75 Acknowledgement: I would like to express my sincere thanks to Mr. Willy De Prins (The Natural History
76 Museum, Department of Life Sciences, Division of Insects, Cromwell Road, London SW7 5BD) for the
77 identification of the Fig tree moth.
78
79 REFERENCES
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83 digestive carbohydrases in the midgut of fig tree skeletonizer moth, Choreutis nemorana
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112 African J. of Plant Science and Biotechnology, 4(2), 96-97.
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115 Fig. 1. F. carica tree damaged by C. nemorana in Plovdiv region (42.08167N 24.70416E), 116 Bulgaria during 2016.
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118 Fig. 2. C. nemorana adult emerged on 20 October 2016.
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120 Fig. 3. C. nemorana larva - 30 September 2016.
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122 Fig. 4. Pupae, cremaster.
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124 E-mail: [email protected]
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