Insect herbivores co-occurring on the same host plant interact in various ways. In particular, early-season insect herbivory triggers a wide range of plant responses that can determine the ...performance of herbivores colonizing the plant later in the course of the season. But the strength and direction of such effects are debated, and virtually unknown in the case of novel interactions involving exotic insects in their introduction range. We conducted an observational field study in SW France, a region recently invaded by the Oak Lace Bug (OLB,
Corythucha arcuata
Say). We measured early chewing damage and subsequent OLB damage in four oak species (
Quercus robur
,
Q. pubescens
,
Q. cerris
and
Q. ilex
). We set up a complementary non-choice experiment in the laboratory, feeding OLB with leaves with or without prior herbivory. The four oak species differed in their sensitivity to OLB damage,
Q. ilex
being broadly resistant. Prior herbivory promoted OLB damage in the laboratory experiment, but not in the field. However, prior herbivory did not alter the rank of oak resistance to the OLB. Our results suggest possible synergistic effects between spring defoliators and the OLB. This study brings insight into herbivore-herbivore interactions and their possible implications for forest management.
Corythucha arcuata, commonly known as the oak lace bug (OLB), is an insect species originally native to North America that has become an invasive species of significant concern in Europe. This ...invasive pest has been observed in various European countries, raising concerns about its impact on forest ecosystems. In 2015, it was first documented in Romania, further highlighting the need for research on its bioecology and life cycle. This study investigated the bioecology of the OLB in the southern region of Romania, focusing on its life cycle, development, and population dynamics. The results indicated that the OLB has three generations per year and overwinters in the adult stage in sheltered locations. Temperature significantly influenced the timing of egg hatching, nymph appearance, and adult development, with variation observed between generations. Additionally, a life table analysis provided insights into the population dynamics of the OLB in its natural environment, revealing variation in egg laying trends across generations. This research contributes to a better understanding of the OLB’s bioecology and provides essential data for forest managers developing science-based management strategies to mitigate its impact. By elucidating the life cycle and development patterns of the OLB in southern Romania, this study aids in the development of predictive models and life tables tailored to the region. These findings empower forest managers with the knowledge needed to make informed decisions for effective OLB management, ultimately preserving the health of forest ecosystems.
The aim of the research was to present current data on the distribution and development of some alien phytophagous insects in the territory of Ukraine.We considered 19 species of alien phytophagous ...insects, including 2 species of Coleoptera, 7 Hemiptera (including 4 bug species), 7 Lepidoptera, 2 Hymenoptera, and 1 Diptera. Hyphantria cunea penetrated Ukraine about 70 years ago and sometimes outbreaks in orchards or shelterbelts. Cameraria ohridella and Cydalima perspectalis pose a great threat to Aesculus hippocastanum and Buxus sempervirens, respectively, in urban stands. Parectopa robiniella, Macrosaccus robiniella, Nematus tibialis, and Obolodiplosis robiniae did not attract the attention of researchers until recently, since did not show a noticeable effect on the health condition of Robinia pseudoacacia. Phyllonorycter issikii is not abundant in most parts of Ukraine. Phyllonorycter platani and Corythucha ciliata are not serious pests because their host plant (Platanus sp.) is rather rare in Ukraine. Trichoferus campestris is known long ago but has not yet shown any harmful effects. The threat from sucking insects (aphids and bugs) increases due to their ability to vector tree pathogens. The polyphagous Halyomorpha halys can pose a threat to forest, ornamental and agricultural plants. Leptoglossus occidentalis poses a great danger to the restoration of Scots pine forests because its feeding decreases the seeds’ germination. Corythucha arcuata is found only in two regions but is moving northward and may pose a threat to oak stands. Agrilus planipennis has spread over several years from the eastern border with Russia to the entire Luhansk and partly Kharkiv region, inhabits Fraxinus excelsior and F. pennsylvanica, and can move west.
Abstract The North American oak lace bug ( Corythucha arcuata ) was first discovered in Europe (Norhern Italy) in 2000. It started a rapid area expansion in the last decade and has been reported in ...20 countries so far. Almost all European oaks are suitable hosts. On top of the host availability, abiotic factors like weather/climate may also have a decisive impact on its further spread and future outbreaks. We conducted a simple field survey within three years, at five locations to estimate the overwintering mortality of the species. Our results suggest that not even a relatively harsh winter (as 2016/2017) caused severe mortality in the overwintering populations. The average mortality of the nine year/location combinations was 30.6% (range 9.1–58.5%). Based on this, the low winter temperature is unlikely to restrict its further spread, therefore continuing area expansion can be predicted.
The results of observations of the mass accumulations of adults of the harmful invasive oak lace bug,
Corythucha arcuata
(Say, 1832), in 2018 and 2021 at the highest point of the Ai-Petri Plateau ...(Crimea; 1234 m a.s.l.) are presented. The approximate number of aggregations of this species reached several thousand specimens, and the density of groups reached 50 specimens/dm
2
of cableway structures. There are no food plants of this invader on the plateau. It is most likely that adults of
C. arcuata
are brought to the plateau by vertical air currents from the areas located below, where the pest successfully reproduces and develops. The Ai-Petri Plateau is a reserve of the adult pest, which provides its expansion to other territories of southern Crimea by air currents. Chemical control of the
C. arcuata
population at the apex of Mount Ai-Petri is recommended.
Background and Purpose: The declining and dieback of lowland oak forests as the result of global climate change, as well as the attack of various pathogenic organisms, industrial pollution, and other ...negative effects reduce acorn yield and will continue to do so in the future. As a result of this fact, the areas on which artificial regeneration will be applied by planting seedlings will have to be increased. The artificial regeneration process is more expensive than the natural one, so protection measures need to be applied to minimize the loss of young seedlings.
Materials and Methods: Experimental plots were set up in the forest area of Spačva Basin. A completely randomized block design experiment in four repetitions was used, in which four variants of planting and protection of oak seedlings were examined. We tested polypropylene tree shelters and hydrophilic superabsorbent based on maize starch. Heights of the plants were measured by measuring tape, and survival was registered by numbering of dead and living plants. For statistical purposes, we have used analysis of variance (repeated measure ANOVA), which allows us to prove statistically significant difference between morphological traits of studied variants.
Results: Two years after planting, the lowest level of survival was found in unprotected seedlings (79.5%), while tree shelters provided the best conditions for seedlings survival (88.75%). In the case with the hydrophilic granules Zeba the result is slightly worse. When analyzing average height in a particular case, significantly higher plants are recorded in cases where the polypropylene tree shelters are used. The average height, with tree shelters (128.27 cm), is more than three times higher than the unprotected seedlings (37.97 cm). The addition of hydrophilic granules did not show a statistically significant difference. In cases where the seedlings were not under the tree shelter protection, the effect of hydrophilic granules was also not statistically significant.
Conclusions: Sheltering accelerated the height growth of the planted oaks substantially and also provided best conditions for seedlings survival. During the research period the usage of Zeba did not justify the purpose for which it was applied. Although the first results are promising in order to gain a complete insight into the potential of tree shelters it is necessary to record the changes and maintain the experiment for a further 2-3 years with quantification of other harmful factors that may appear (drought, game etc.) after which a more reliable judgment regarding their usefulness could be provided.
Bu çalışma, Tekirdağ ilinde odunsu bitkiler üzerindeki Tingidae familyası türleri ve yayılışlarını saptamak amacıyla yürütülmüştür. Tekirdağ’ın Malkara, Saray, Süleymanpaşa ve Şarköy ilçelerinde, ...2011-2012 yıllarında yürütülen sürvey çalışmalarında gözle kontrol ve darbe yöntemleri kullanılmıştır. Çalışma sonucunda Corythucha arcuata (Say), Corythucha ciliata (Say), Monosteira unicostata (Mulsant & Rey), Physatocheila confinis Horváth ve Stephanitis pyri (Fabricius) olmak üzere beş Tingidae türü tespit edilmiştir. Bu türlerden C. arcuata, M. unicostata ve P. confinis Tekirdağ ili faunası için ilk kayıttır. S. pyri ise ilde en yaygın ve bol bulunan tür olarak belirlenmiştir.
First record of oak lace bug Corythucha arcuata (Tingidae: Heteroptera) in Romania. 7th ESENIAS Workshop with Scientific Conference, 28-30 March 2017, Sofia, Bulgaria. First detection of Halyomorpha ...halys Stål, a new invasive species with a high potential of damage on agricultural crops in Romania. First record of a new alien invasive species in Romania: Phyllocnistis vitegenella Clemens (Lepidoptera: Gracillariidae). First discovery of an alien insect pest, Prociphilus fraxinifolii (Hemiptera: Aphididae, Pemphiginae) in China.
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