| evaluation of diets for the development and reproduction of franklinothrips orizabensis (thysanoptera: aeolothripidae). | the suitability of ten diets for the development and reproduction of franklinothrips orizabensis johansen, the key natural enemy of scirtothrips perseae nakahara, a pest of california grown avocados, was determined in the laboratory. the experimental diets evaluated were: (i) irradiated ephestia kuehniella zeller eggs; (ii) irradiated e. kuehniella eggs and avocado pollen; (iii) tetranychus pacificus mcgregor eggs; (iv) t. pacificus eggs and avocado pollen; (v) irradiated e. kuehniella eggs and ... | 2001 | 11587623 |
| impact of sulfur on density of tetranychus pacificus (acari: tetranychidae) and galendromus occidentalis (acari: phytoseiidae) in a central california vineyard. | sulfur is the oldest and most widely used fungicide in the vineyards of california, where it is used for control of powdery mildew (uncinula necator [schw.] burr). for decades, sulfur use has been associated with outbreaks of tetranychus pacificus mcgregor (acari: tetranychidae) on cultivated grapes in the san joaquin valley. i undertook large-scale field studies to test this association, to evaluate the impact of sulfur on galendromus occidentalis (nesbit) (acari: phytoseiidae), a major predato ... | 2007 | 17611804 |
| efficacy of silwet l-77 against several arthropod pests of table grape. | silwet l-77, an organosilicone surfactant, was applied to several arthropod pests of california table grapes. eggs of grape mealybug, pseudococcus maritimus (ehrhorn), and omnivorous leafroller, platynota stultana walsingham, were tolerant to 0.1, 0.25, and 0.5% treatment solutions; however, eggs of pacific spider mite, tetranychus pacificus mcgregor, were highly susceptible with mortality >99.4% (0.1% silwet l-77). mortality of immature and adult stages of cotton aphid (aphis gossypii glover), ... | 2003 | 12650369 |
| jasmonic acid induced resistance in grapevines to a root and leaf feeder. | we investigated the effects of induced resistance to the folivore pacific spider mite, tetranychus pacificus mcgregor (acari: tetranychidae), as well as the root-feeding grape phylloxera daktulosphaira vitifoliae (fitch) (homoptera: phylloxeridae) in grapevines using exogenous applications of the natural plant inducer, jasmonic acid. foliar jasmonic acid application at concentrations that caused no phytotoxicity significantly reduced the performance of both herbivores. there were less than half ... | 2000 | 10902339 |
| small-scale intraspecific life history variation in herbivorous spider mites (tetranychus pacificus) is associated with host plant cultivar. | life history variation is a general feature of arthropod systems, but is rarely included in models of field or laboratory data. most studies assume that local processes occur identically across individuals, ignoring any genetic or phenotypic variation in life history traits. in this study, we tested whether field populations of pacific spider mites (tetranychus pacificus) on grapevines (vitis vinifera) display significant intraspecific life history variation associated with host plant cultivar. ... | 2013 | 24058453 |
| molecular approach in spider mites (acari: tetranychidae): preliminary data on ribosomal dna sequences. | dna sequence data were used to examine phylogenetic relationships between six species of economically important tetranychidae mites: eotetranychus carpini (oudemans), e. pruni (reck), tetranychus pacificus mcgregor, t. mcdanieli mcgregor, t. turkestani ugarov & nikolski and t. urticae koch. with primers directed toward conserved elements flanking the target region, the polymerase chain reaction was used to amplify the its2 spacer of the ribosomal dna molecule. the nucleotide sequence of a 300-bp ... | 1992 | 1451609 |
| ethyl formate as a postharvest fumigant for selected pests of table grapes. | ethyl formate (ef) in combination with co2 was tested for control of arthropods commonly infesting california table grapes. in addition, table grape tolerance to ef exposure was evaluated. lc99 estimates were developed for target pests by using a range of ef concentrations (0.04-4.7% ef). response to treatments varied greatly between species, as well as life stages within species. western flower thrips, frankliniella occidentalis (pergande), and adult and crawler stages of grape mealybug, pseudo ... | 2007 | 17849855 |
| pest response in packed table grapes to low temperature storage combined with slow-release sulfur dioxide pads in basic and large-scale tests. | the effect of low temperature storage combined with slow release sulfur dioxide pads was determined in basic laboratory and large-scale commercial tests on western flower thrips, frankliniella occidentalis pergande; grape mealybug, pseudococcus maritimus (ehrhorn); pacific spider mite, tetranychus pacificus mcgregor; twospotted spider mite, tetranychus urticae koch; and omnivorous leafroller, platynota stultana walshingham. temperatures within the foam containers among the packed clusters decrea ... | 2001 | 11561862 |
| population growth and predation interference between two species of predatory phytoseiid mites (acarina: phytoseiidae) in interactive systems. | populations of two species of phytoseiid mite predators, phytoseiulus persimilis athias-henriot and amblyseius degenerans (berlese), feeding on a tetranychid prey, tetranychus pacificus mcgregor, were allowed to grow separately as well as together on bush lima bean (phaseolus lunatus var.) arenas in the laboratory. the population plateau attained by p. persimilis was nearly 5 times higher than that for a. degenerans when each species was on separate leaf arenas. when they were on the same arena, ... | 1989 | 28312827 |
| plant water stress, leaf temperature, and spider mite (acari: tetranychidae) outbreaks in california vineyards. | we evaluated the relationships between plant water status and leaf temperature, and between leaf temperature and spider mite (acari: tetranychidae) and predatory mite (acari: phytoseiidae) populations in eight vineyards in california in 2006 and 2007. temperature of south-facing leaves increased significantly by 0.8°c for every 1.0°c increase in ambient air temperature, and by 5.3°c for every one mpa drop in leaf water potential. peak population densities of pacific spider mite, tetranychus paci ... | 2010 | 22127173 |
| development of acaricide resistance in pacific spider mite (tetranychus pacificus) from california vineyards. | in recent years, grape growers in california reported failures of acaricides against tetranychus pacificus mcgregor. we collected t. pacificus populations from four vineyards and tested them for resistance to bifenazate, propargite and pyridaben. in addition, we sequenced part of the cytochrome b gene of bifenazate-resistant and -susceptible t. pacificus to test for the presence of mutations reported to confer resistance to the congeneric t. urticae. none of the mutations conferring resistance t ... | 2010 | 19771398 |