The aerial parts of A. chrysocoma and A. coarctata afforded 22 and 9 sesquiterpene lactones, respectively. All the compounds described are new for the studied species. The lactones 5, 6 and 12 are new for the genus Achillea.

Computers are by their definition predictable. The problem of obtaining good-quality random numbers is well known. There is a great need for entropy in the running kernel, as well as in user-space. The kernel needs to randomise TCP sequences, seed keys for IPSec, randomise PIDs, and so on. Starvation of these random numbers is a critical problem. Users need random keys, random filenames, nondet...

Heterodera achilleae n. sp., a member of the H. rostochiensis group, is described and illustrated from roots of yarrow, Achillea millefolium L. in Sarajevo, Yugoslavia. This new, round-cyst species differs from closely related species especially as follows: (1) from H. leptonepia, by having stouter larvae (a = 21), with longer styler (25 mu), and with outlet of dorsal esophageal gland averaging...

The research was carried out on 23 host plants and the attack of 32 fungal pathogens identified.
 identified were classified by incidence value (F%) into main pathogens, secondary potential pests.
 that attacked key chrysanthemum, snapdragon, marigold, yarrow, yucca rose. from group peony, sedge, oxeye, hydrangea, hyacinth, queen night, sage cloves. Attack harmful has been recorded gl...

encouraging natural enemies by growing attractive plants is considered an effective method of pest control in organic farming. however, it is important to identify which flowers best attract beneficial insects. in this study, relative attractiveness of 16 species of flowering plants to adult hoverflies was assessed by conducting timed observations of feeding-visit frequencies. the experiments w...