| efficacy of five volatile oils and their mixtures against the mealybug, icerya seychellarum seychellarum (westw.) infesting sago palm, cycas revoluta in alexandria, egypt. | five tested plant volatile oils and their mixtures were evaluated for controlling the margarodid, icerya seychellarum seychellarum (westw.) on growing sago palms in antoniades public gardens, alexandria, egypt. the tested volatile oils at concentration rates of 0.5, 1 and 1.5 % (v/v) were as follows: camphor 20%; dill 20%; rose 30%; peppermint 20% and clove 30% (v/v). their mixtures were camphor/peppermint; camphor/rose; at a rate of 1:1 camphor/rose/ peppermint at 1:1:2 and camphor/rose/dill at ... | 2009 | 20222604 |
| infestation of the coccid, icerya seychellarum (westw.), on the mangrove avicennia marina (forsk.) vierh. on aldabra atoll, with special reference to tree age. | the level of infestation by the coccid icerya seychellarum on the mangrove tree avicennia marina was measured on a stand of ca. 670 trees on aldabra atoll in 1978. trees varied in basal trunk diameter (btd) between 3 and 30 cm. leaf infestation increased significantly with increasing btd-class and young trees (btd 3.0-4.5 cm) had a mean infestation of 0.3 mg coccids g(-1) leaf whilst the heaviest infested trees (btd 13.0-14.5 cm) supported 7.6 mg g(-1). leaf and shoot growth were not correlated ... | 1980 | 28309558 |
| host-tree susceptibility to the coccid icerya seychellarum westw. (margarodidae: homoptera) on aldabra atoll: the rôle of leaf morphology, chemistry and phenology. | the relative susceptibility of thirty-tree species to feeding by the coccid, icerya seychellarum, (from a previous atoll survey) were correlated with four morphological characters (leaf lamina and midrib thicknesses, density of hairs on leaf underside and presence of waxy upper leaf surface) and the concentrations of six mineral elements (n, p, k, ca, mg and na) and three measures of chemical defense (total phenols, condensed tannins and alkaloids). for twenty-two species four phenological varia ... | 1983 | 28310692 |
| ultrastructural studies on icerya seychellarum seychellarum (westwood) ovaries (hemipotera: margarodidae). | the paired ovaries of the scale insect icerya seychellarum are composed of large number of telotrophic ovarioles that are devoid of terminal filaments. each ovariole is subdivided into an apical tropharium (= trophic chamber) and the vitellarium. the tropharium contains 7 trophocytes, while a single oocyte develops in the vitellarium. the tubular paired accessory glands are also been distinguished. this investigation clearly points out the cytotogical features of the ovaries as well as the acces ... | 2008 | 19226791 |
| interactions between the coccid, icerya seychellarum (westw.), and its host tree species on aldabra atoll : i. euphorbia pyrifolia lam. | (i) the growth of ca. 100 individuals of a small deciduous tree euphorbia pyrifolia, of different ages and edaphic regimes, and with different levels of infestation by the coccid icerya seychellarum, has been studied on aldabra atoll over two years (1976-1978). infestation on leaves ranged between 0 and 1.3 mg dry weight of coccids cm-2 of total leaf area. (ii) field observations and an experiment in which coccids were "seeded" on to transplanted trees showed a preference of coccids to feed on s ... | 1980 | 28309670 |
| interactions between ants and the coccid icerya seychellarum on aldabra atoll. | infestations of the phloem feeding coccid icerya seychellarum on the natural vegetation of aldabra atoll are attended at night by large numbers of the large ant componotus maculatus and, during the day, by small numbers of other ant species.large ant species preferentially tended larger coccids. the efficiency of c. maculatus worker spacing among the patchily distributed icerya resource on a plant, was dependent upon the overall ant/icerya biomass ratio. at high ratios (i.e. low resource availab ... | 1980 | 28309564 |
| interactions between the coccid, icerya seychellarum (westw.) and its host tree species on aldabra atoll : ii. scaevola taccada (gaertn.) roxb. | (i) in an area of coastal scrub on aldabra atoll the growth and phenology of 120 bushes of scaevola taccada was measured along three transects stretching 200 m inland from the sea, between may 1977 and november 1978. correlations between bush parameters, the infestation by the coccid icerya seychellarum and prevailing saline conditions were measured. considerable death (up to 50% of labelled clusters) of s. taccada occurred in 1977-78. leaf infestation ranged from 0 to 1.6 mg dry weight of cocci ... | 1980 | 28309671 |
| ultrastructure of egg shell of four different coccoidea species in egypt. | the present study was initiated to perform a comparative measurements of egg dimension and structure of four different species pertaining to three families of the super family: coccoidea. these species were: mycetaspis personata (comstock) (diaspididae), ceroplastes floridensis (comstock) (coccidae), pulvinaria psidii (maskell) (coccidae), and icerya seychellarum seychellarum (westw.) (margarodidae). the studied species differed in their means of egg laying and chorion structure, which may expla ... | 2008 | 19226792 |