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defoliation of alders (alnus glutinosa) affects herbivory by leaf beetles on undamaged neighbours.the effects of defoliation of alder (alnus glutinosa) on subsequent herbivory by alder leaf beetle (agelastica alni) were studied in ten alder stands in northern germany. at each site, one tree was manually defoliated (c. 20% of total foliage) to simulate herbivory. subsequent damage by a. alni was assessed on ten alders at each site on six different dates from may to september 1994. after defoliation, herbivory by a. alni increased with distance from the defoliated tree. laboratory experiments ...200028547220
a new biopesticide from a local bacillus thuringiensis var. tenebrionis (xd3) against alder leaf beetle (coleoptera: chrysomelidae).use of chemical pesticides in agriculture harms humans, non-target organisms and environments, and causes increase resistance against chemicals. in order to develop an effective bio-pesticide against coleopterans, particularly against agelastica alni (coleoptera: chrysomelidae) which is one of the serious pests of alder leaf and hazelnut, we tested the insecticidal effect of 21 bacillus isolates against the larvae and adults of the pest. bacillus thuringiensis var. tenebrionis-xd3 (btt-xd3) show ...201728405911
nonglandular leaf trichomes as short-term inducible defense of the grey alder, alnus incana (l.), against the chrysomelid beetle, agelastica alni l.the grey alder compensates leaf area losses due to insect grazing by continuously producing new leaves throughout the vegetative period. different degrees of defoliation were attained experimentally by a controlled release of the oligophagous beetle agelastica alni on arbitrarily selected trees from a homogenous population of young alders. the reduction in leaf area per tree significantly influenced the density of leaf trichomes, assessed 10-30 days later, on newly sprouting leaves only. cross-c ...199128313838
fine structure of the kinetochores in six species of the coleoptera.kinetochore structure was examined in a total of 6 species from 5 different families of the coleoptera using transmission electron microscopy of ultrathin serial sections. metaphase spermatogonia and primary and secondary spermatocytes were studied in tenebrio molitor (tenebrionidae) to determine whether kinetochore structure varies depending on the cell type. in all three cell types, the kinetochore microtubules (mts) were in direct contact with the chromosomal surface, and kinetochore plates w ...199718464835
energy metabolism and metabolic rate of the alder leaf beetle agelastica alni (l.) (coleoptera, chrysomelidae) under aerobic and anaerobic conditions: a microcalorimetric study.in early fall, adult alder leaf beetles (agelastica alni l.) retreat, for overwintering, to the top layer of the soil near their forage trees where the ground gets easily waterlogged so that the beetles will be submerged and cut off from atmospheric oxygen. hence, unlike most other adult insects, alder leaf beetles encounter hypoxia/anoxia in their natural habitat and this may occur at moderate temperature. exposing beetles to pure nitrogen gas at 20 degrees c had similar behavioral and metaboli ...200212770113
how to spoil the taste of insect prey? a novel feeding deterrent against ants released by larvae of the alder leaf beetle, agelastica alni.chemical defense of leaf beetle larvae (chrysomelidae) against enemies is provided by secretions containing a wide range of deterrent compounds or by unpalatable hemolymph constituents. here we report a new, very strong feeding deterrent against ants released by larvae of the alder leaf beetle agelastica alni when attacked. the larvae release a defensive fluid from openings of pairwise, dorsolaterally located tubercles on the first to the eighth abdominal segments. the fluid, consisting of hemol ...201020632433
cry3aa11: a new cry3aa delta-endotoxin from a local isolate of bacillus thuringiensis.a local isolate of bacillus thuringiensis mm2 had insecticidal activity against the larvae of melolontha melolontha, agelastica alni, leptinotarsa decemlineata and amphimallon solstitiale and produced a 65 kda protein. sds-page profile of b. thuringiensis mm2 was compared with those of 29 different cry3aa producers which verified cry3aa biosynthesis by the isolate. the cry3aa gene of mm2 was cloned, sequenced and the deduced amino acid sequence was compared with the cry3aa sequences of ten diffe ...200516132862
does lignin modification affect feeding preference or growth performance of insect herbivores in transgenic silver birch (betula pendula roth)?transgenic silver birch (betula pendula roth) lines were produced in order to modify lignin biosynthesis. these lines carry comt (caffeate/5-hydroxyferulate o-methyltransferase) gene from populus tremuloides driven by constitutive promoter 35s camv (cauliflower mosaic virus) or ubb1 (ubiquitin promoter from sunflower). the decreased syringyl/guaiacyl (s/g) ratio was found in stem and leaf lignin of 35s camv-ptcomt transgenic silver birch lines when compared to non-transformed control or ubb1-ptc ...200515971066
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