| psyllids as a potential source of heavy metals for predators. | contents of al, fe, zn, cu, cd, mn, ni, and hg were determined in 14 species of psyllids and in leaves of their host plants from unpolluted sites (finland) and industrially polluted sites in poland. generally, psyllids accumulated low amounts of metals, but their metal burdens increased with age. exuvia were important for the elimination of al, ni, and mn, and larval wax for al, cu, and ni. biomagnification of metals, expressed as the concentration factor (cf) was low (cf: 0.56-1.08) for mn, al, ... | 1997 | 9175502 |
| candidate insect vectors of apple proliferation in northwest spain. | the apple proliferation (ap) disease is spread mostly by two psyllids. each species plays a predominant role as ap vector that changes regionally. thus, there is an urgent need to identify the ap vectors in each region where the disease is present. this research aimed at identifying the psyllid community in apple orchards from asturias (nw spain) and studying their possible role in ap transmission. yellow sticky traps were used to monitor psyllid community in five cider-apple orchards during 2 y ... | 2016 | 27536523 |
| holocentric chromosomes in meiosis. ii. the modes of orientation and segregation of a trivalent. | the modes of orientation and segregation of the sex chromosome trivalent x1x2y in male meiosis of cacopsylla mali (psylloidea, homoptera) were analysed. males with an x1x2y sex chromosome system coexist with males displaying a neo-xy system in populations of this species. the fusion chromosome resulting in the formation of a trivalent in meiosis originates from the fusion of an autosome with the neo-y chromosome. in the majority of metaphase i cells (92.4%) the x1x2y trivalent showed co-orientat ... | 2006 | 16823618 |
| chromosome banding in cacopsylla mali (schmidberger) and cacopsylla sorbi (linnaeus) (homoptera, psyllidae) with polymorphic sex chromosomes. | c-banding and ag staining were applied to cacopsylla sorbi and c. mali. the aim was to discover some additional cytological markers to follow the pathways of the sex determination system transformation in the evolution of the species. of three karyotype patterns so far described in the literature for these species--a type a (xo), b (neoxy) and c (neox1x2y), only the last two types (b and c) were found. all 6 studied cacopsylla sorbi from finland had a karyotype of type b (2n = 20 + xy), while c. ... | 2001 | 11987451 |