| 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 |
| investigating alternatives to traditional insecticides: effectiveness of entomopathogenic fungi and bacillus thuringiensis against citrus thrips and avocado thrips (thysanoptera: thripidae). | citrus thrips, scirtothrips citri (moulton) (thysanoptera: thripidae), is a plant-feeding pest most widely recognized for causing damage to citrus (citrus spp. l. [rutaceae]) and mango (mangifera indica l. [anacardiaceae]) fruits. this insect has recently broadened its known host range to become a significant pest of california grown blueberries. avocado thrips, scirtothrips. perseae nakahara (thysanoptera: thripidae), is a recent, invasive pest of california avocados, persea americana mill. (la ... | 2013 | 23448016 |
| the scirtothrips perseae species-group (thysanoptera), with one new species from avocado, persea americana. | following recent molecular studies on avocado thrips, a new species is described from costa rica, ecuador, and colombia from the young leaves of avocado, persea americana. scirtothrips hansoni sp.n. is closely related to the californian pest, s. perseae, and also to s. astrictus from costa rica that remains known from a single female. an illustrated key to these three species is provided. | 2016 | 27396014 |
| field evaluation of systemic imidacloprid for the management of avocado thrips and avocado lace bug in california avocado groves. | the efficacy of systemic applications of imidacloprid for the management of avocado thrips and avocado lace bug was determined in field trials. following insecticide treatment by chemigation, leaves of appropriate age for each insect were sampled over a 6 month period and used for bioassays. imidacloprid residues were measured by elisa in leaves used for bioassays to determine concentrations of insecticide that were toxic to both pests. | 2010 | 20623704 |
| evaluation of neonicotinoid, organophosphate and avermectin trunk injections for the management of avocado thrips in california avocado groves. | trunk injections of systemic insecticides were evaluated for the management of avocado thrips. insecticide residues were quantified in leaves to determine when after treatment, and for how long, toxic concentrations of the insecticides were present. residues in fruit were quantified to determine whether trunk injection of insecticides might present a greater risk than traditional application methods for contaminating fruit. | 2012 | 22396314 |
| toxicity of systemic neonicotinoid insecticides to avocado thrips in nursery avocado trees. | the efficacies of four systemic neonicotinoid insecticides applied to potted avocado trees at manufacturer-recommended rates were assessed against the avocado thrips, scirtothrips perseae nakahara. at the time of treatment, fully expanded first-flush young leaves were tagged for identification, and a proportion of these leaves was used in bioassays with second-instar thrips. at 7 weeks post-treatment, a second flush of leaves had fully expanded on the trees, and these leaves were included in add ... | 2007 | 17654635 |
| resistance of avocado thrips (thysanoptera: thripidae) to sabadilla, a botanically derived bait. | bioassays were conducted on four avocado thrips (scirtothrips perseae nakahara) populations in southern california that had had limited past exposure to the botanical pesticide sabadilla, with the objective of establishing baseline susceptibility levels for the purpose of resistance monitoring. reports of avocado thrips resistance in a grove that had received six sabadilla sprays over 2 years were confirmed when a bioassay indicated resistance ratios of 7.6 and 18.8 at the lc50 and lc90, respect ... | 2006 | 16791911 |
| quantification of imidacloprid toxicity to avocado thrips, scirtothrips perseae nakahara (thysanoptera: thripidae), using a combined bioassay and elisa approach. | a competitive elisa (enzyme-linked immunosorbent assay) technique was evaluated for quantifying titres of imidacloprid in homogenates of leaf discs sampled from avocado plants treated with systemic applications of imidacloprid 240 g litre(-1) sc (admire). matrix effects were evident with undiluted leaf tissue homogenates, but these were effectively eliminated by dilution of homogenates in water. in a field trial conducted in a commercial nursery, there was an excellent correlation between imidac ... | 2005 | 15834841 |
| developmental and reproductive biology of scirtothrips perseae (thysanoptera: thripidae): a new avocado pest in california. | the developmental and reproductive biology of a new avocado pest, scirtothrips perseae nakahara, was determined in the laboratory at five constant temperatures, 15, 20, 25, 27.5 and 30 degrees c. at 20 degrees c, s. perseae exhibited greatest larval to adult survivorship (41%), and mated females produced a greater proportion of female offspring at this temperature when compared to 15, 25, 27.5 and 30 degrees c. average lifetime fecundity and preoviposition period was greatest at 15 degrees c at ... | 2002 | 12191435 |
| effects of aerial spray volume, coverage, and abamectin on scirtothrips perseae (thysanoptera: thripidae). | helicopter applications using abamectin in different spray volumes were made against scirtothrips perseae nakahara in ventura county, ca. on small (2.2 m tall) trees, spray coverage on water-sensitive papers was 24-48% and 43-97% for 468 and 935 liter/ha volume treatments, respectively. on large (6.2-8.1 m tall) trees, spray coverage was lower and quite variable, from 1 to 28% and 10 to 70% for 468 and 935 liter/ha treatments, respectively. on small trees, 468, 701, and 935 liter/ha with a high ... | 2001 | 11681670 |
| effects of aerial spray volume, coverage, and sabadilla on scirtothrips perseae (thysanoptera: thripidae). | helicopter applications using sabadilla (27-57 g [ai]/ha and 11.1-23.7 kg/ha sugar bait) in different volumes of water were made on avocado against scirtothrips perseae nakahara in ventura county, ca. on small (2.8 m tall) trees, volumes of 374 and 795 liter/ha resulted in 3-18% and 19-43% spray coverage, respectively, on water-sensitive papers. on large (6.9-8.4 m tall) trees, these volumes resulted in only 1-3% and 6-11% coverage, respectively. on small trees, sabadilla in 374 liter/ha signifi ... | 2001 | 11681669 |