| extrafloral nectar in an apple ecosystem to enhance biological control. | a common goal of conservation biological control is to enhance biodiversity and increase abundance and effectiveness of predators and parasitoids. although many studies report an increase in abundance of natural enemies, it has been difficult to document increases in rates of biological control. to enhance parasitism of the tufted apple bud moth, platynota idaeusalis (walker) (lepidoptera: tortricidae), alternate food was provided by interplanting peaches bearing extrafloral nectaries into apple ... | 2010 | 21061965 |
| scale insects and mealy bugs (homoptera: coccoidea) attacking deciduous fruit trees in the western north coast of alexandria, egypt. | this investigation covered a survey of scale insects and mealy bugs infesting ten growing species of deciduous fruit trees in three localities in alexandria govemorate. these localities were merghem, burg el-arab, and el-nahda about 50 km. west of alexandria under both rain-fed and irrigation system conditions. the common inspected fruit trees were fig, white mulberry, pomegranate, apple, pear, apricot, european plum, peach, almond, and persimmon. it was shown that a group of twenty scale insect ... | 2008 | 19226793 |
| ecological studies on san josé scale, diaspidiotus perniciosus (comstock) (homoptera: diaspididae) as a new insect pest on pear trees in burg el-arab area, alexandria, egypt. | the san josé scale, d. perniciosus (comstock) (homoptera: diaspididae) was noticed on pear trees all the year round in burg el-arab area (50 km west of alexandria). bio ecology and population fluctuations of this serious scale insect were carried out during the two subsequent seasons of september, 2004 until august, 2006. the calculated infestation rates (%) assured the presence of three peaks in both seasons. the estimated densities of fluctuating individuals of d. perniciosus on the inspected ... | 2008 | 19226784 |
| resistance management for san jose scale (hemiptera: diaspididae). | the san jose scale diaspidiotus perniciosus comstock is one of the most important pests of deciduous fruit trees. the major cause of recent outbreaks in apple orchards is thought to be the development of insecticide resistance, specifically organophosphates. the first report was given in north america, and now, in chile. in the present study, san jose scale populations collected from two central regions of chile were checked for their susceptibility to different mode of action insecticides in or ... | 2015 | 26470382 |
| comparative analysis of three scale insect species populations (hemiptera: coccoidea: diaspididae) and their parasitoid, aphytis diaspidis(howard) on pear trees in burg el-arab area, alexandria, egypt. | the infestation abundance of each of the inspected scale insect species: san jose scale, diaspidiotus perniciosus (comstock), greedy scale, hemiberlisio rapax (comstock) and olive scale, parlatoria oleae (cloveé) on pear trees, more or less varied as the months of each growing season differed. the comparative abundance percentages in both seasons of 2004-2005 and 2005-2006 were (51.80 and 51.40), (41.20 and 40.90) and (7.10 and 7.70) of the counted individuals of the grand total of h. rapax, d. ... | 2009 | 20218536 |
| flagellar sensilla of quadraspidiotus perniciosus comstock (rhynchota: diaspididae) male. | the flagellar sensory structures of quadraspidiotus perniciosus comstock (rhynchota: diaspididae) male have been investigated, using scanning and transmission electron microscopy. five categories of sensilla have been identified: three types of sensilla trichodea, a sensillum coeloconicum and a sensillum basiconicum. the possible function of sensilla is discussed, considering their location, morphology and ultrastructure. no gustatory sensilla have been detected. all the setae (sensilla trichode ... | 2004 | 15219906 |
| fine structure of spermiogenesis in the coccid insect aspidiotus perniciosus: late stages of differentiation and structure of the mature sperm bundles. | spermatids of a. perniciousus are organized into bundles each containing 32 cells. during the process of differentiation, nuclear elongation and chromatin condensation take place. the mature sperm bundles are finally surrounded by the secondary sheath which is composed of a trilaminar membrane. the mature sperm is not differentiated into head, mid piece or tail but has two tapering ends and an electron dense central core. centrioles, the nuclear membrane, mitochondria and a flagellum appear to b ... | 1992 | 1500764 |
| [composition of insect waxes. ii. waxes of the coccinellids, ceroplastes rusci, icerya purchasi, pulvinaria flocifera and quadraspidiotus perniciosus]. | | 1965 | 14334815 |
| [population structure and niche of main scale insects in jujube orchards intercropped with wheat]. | to effectively control the scale insects in jujube orchards, a field study was made on the population structure and niche of pseudococcus comstock kuwane, ceroplastes japonicus green and quadraspidiotus perniciosus comstock in the jujube orchards intercropped with wheat in taigu area of shanxi province. the results showed that at the early development stage of jujube trees, these three kinds of scale insects mainly distributed on the southeast direction of the lower and central parts of the tree ... | 2006 | 17044498 |
| phoretic dispersal of armored scale crawlers (hemiptera: diaspididae). | dispersal and colonization of new areas by armored scale insects (hemiptera: diaspididae) is achieved by mobile first-instar nymphs, called crawlers. few studies have considered the actual mechanisms by which crawlers disperse, and although crawlers are capable of actively wandering over short distances (generally < 1 m), their dispersal over longer distances has been thought to be wind-mediated. here, we present evidence of a potentially more important means of dispersal over longer distances ( ... | 2010 | 20857725 |