کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4504934 1321118 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of two shoot-galling biological control candidates on Russian knapweed, Acroptilon repens
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
Impact of two shoot-galling biological control candidates on Russian knapweed, Acroptilon repens
چکیده انگلیسی

Russian knapweed, Acroptilon repens, is one of the most serious exotic invaders of temperate grasslands in North America. Here we present results from a field experiment in which we quantified the impact of two potential biological control agents, the gall wasp Aulacidea acroptilonica V.Bel. (Hymenoptera, Cynipidae) and the gall midge Jaapiella ivannikovi Fedotova (Diptera, Cecidomyiidae), on A. repens under field conditions in the plant’s native range in Uzbekistan. Attack by A. acroptilonica reduced shoot length by 21%, above-ground biomass by 25% and seed output by 75%, while attack by J. ivannikovi reduced shoot length by 12%, above-ground biomass by 24%, and seed output by 92%. The results of these field experiments are likely to accurately reflect the potential of these two gall formers to reduce above-ground biomass and sexual reproduction of A. repens shoots, since the shoots were part of a clonal network. Despite this, the attacked shoots were not able to compensate for the reallocation of plant resources to gall formation. Moreover, the mean number of galls per shoot obtained in the experiments was within the range of observed gall incidences in the native range. The impact of these two gall-forming insects on Russian knapweed in North America will depend on the population size the species reach and on the timing of attack. The highest impact is likely to occur when the insects attack shoots that have not yet started producing flower-buds.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biological Control - Volume 46, Issue 2, August 2008, Pages 101–106
نویسندگان
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