Additionally, the cost of site-specific tactics was compared with whole-plot treatments to determine the economic value of using site-specific management tactics for T. urticae in strawberries. Dear Vaccinologist, The refuge index for the prey decreased with predator density and was higher at greenhouse scale than at plant scale, both at similar predator densities. 0000007594 00000 n <]>> Tungau merah (Tetranychus urticae Koch) meru-pakan jenis hama yang paling penting dalam keluarga Tetranychidae, bersifat polifag dan dapat menyerang sekitar 1.200 jenis tanaman (Xie et al. All rights reserved. 0000004059 00000 n the two-spotted spider mite, ... 'Albion' and 'Oso Grande' are commonly used by growers of southeastern Brazil. This predatory mite occurrence is high on abandoned strawberry fields, but on plants that are yet commercially explored and are sprayed with acaricides the occurrence of P. macropilis is less frequent. 0000001299 00000 n Tetranychus Urticae. This 11-days course (November 22nd to... A greenhouse study was conducted to investigate the host-pest relationships of seven cultivars of strawberry, Fragaria spp., that differed in resistance to the twospotted spider mite, Tetranychus urticae Koch. defensivemechanisms, which in turn influence the behavior of herbivores. ���7�s��z�v,E�X��E"Eݎ"����N�nO�D�L-��\H�Z���c�y�I&��ʀ���+@��0a۶&�b�Jk0]%�_֏+tl� ��@v��9~q�K��1S��y9�8L=�»ӳ�:�1���Ȝ�,.������ȴ�³���R7-R��]X)P�Py1|�Lb�~5�Z �ͪ���Ո������+�f/�3x�x�Ag9����?G�-��M�.��G�M�s��_y���k�� than 50% in three cultivars ‘Camarosa,’ ‘Diamante,’ and ‘Seascape.’ Thus, Mite population development and plant damage were monitored on a weekly basis for 6 wk on initially, La résistance variétale constitue un élément important du contrôle intégré du tétranyque tisserand ; il s'agit du moyen de lutte assurément le moins coûteux et le plus facile à appliquer pour l'horticulteur. 'Floridabelle' showed antibiotic and antixenotic characteristics by supporting the lowest population density and showing lower damage values than other cultivars. The body of a spider mite is separated into two distinct parts: (1) the gnathosoma and (2) the idiosoma. Hot, dry weather is conducive to spider mite outbreaks. Significant differences in stomatal opening occurred between mite-infested and mite-free leaflets with the majority (61%) of the stomata closed in infested tissues. /Type /Catalog The oviposition preference of the red mite Oligonychus yothersi McGregor was evaluated under laboratory in 52 Paraguay tea progenies and one control collected in a local farm. Scanning and transmission electron microscopy were used to investigate damage to strawberry (Fragaria ×ananassa Duch.) The recorded viability above 90% was not influenced by the different cultivars during all the development phases. Mesophyll cells adjacent to damaged regions showed no ultrastruc-tural distortion or disruption of chloroplasts. 0000000016 00000 n @Q�tL������P�CQ�٘@ ^�������C��Bwa�}�D>���jGOEWz4����xc��. Biological control using naturally occurring predators has been attempted. The idiosoma is the remainder of the body and the head, thorax and abdomen of insects. Hamilton Gomes de Oliveira, D.Sc., Universidade Federal de Viçosa, november, 2006. Varietal resistance is a major element in the integrated control of spider mites; it is the least expensive and the easiest technique for plant protection. Injury to strawberry leaves caused by various infestation levels of Tetranychus urticae Koch was studied. The data provide evidences that in some of the progenies evaluated there is resistance by non-preference to oviposition of the Paraguay tea red mite. The glandular hairiness affected neither consumption nor fecundity of N. californicus. "Sunrise" is the cultivar most adequate for T. urticae development, considering that mites assayed in this cultivar showed a larger production of eggs per female, longer female longevity, and higher reproduction rate (larger Ro, rm and λ and smaller Td). foi registrado na primavera. It was observed that on cultivars such as ‘Aromas,’ ‘Camarosa,’ and trailer A fertilized female was transferred to a leaf dish (n=50 repetitions) and was removed after a period of 12 hours and evaluations were done every 12 hours recording the incubation period, length of immature stage, longevity and fecundity of adults and viability of these stages. 0000001558 00000 n endstream endobj 33 0 obj<> endobj 35 0 obj<> endobj 36 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 37 0 obj<> endobj 38 0 obj<> endobj 39 0 obj<> endobj 40 0 obj<> endobj 41 0 obj<> endobj 42 0 obj<> endobj 43 0 obj<> endobj 44 0 obj<> endobj 45 0 obj<> endobj 46 0 obj<> endobj 47 0 obj<> endobj 48 0 obj<>stream All cultivars observed were capable of supporting high populations of mites. Damage can be seen as chlorosis of the leaves where the mites have been feeding. 0000006569 00000 n Both populations were overdispersed, although in general terms, N. californicus exhibited lower aggregation than T. urticae. However, some cultivars, and clone DL-40, gave results significantly different from 'Elsanta' for these parameters. 0000003018 00000 n Mites assayed in "Tainung 01" cultivar showed a shorter duration of the egg, larva, protonymph and egg-adult. The assayed cultivars belongs to the "Formosa" ("Tainung 01" and "Calimosa") and from the "Solo" ("Golden" and "Sunrise") groups. /Parent 5 0 R temporal delay, by those of the predator. laid more eggs on ‘Seascape’ (8.4 eggs/day), and the least on ‘Camarosa’ Results from experiments with the progeny of crosses using cultivars/clones showing reduced fecundity did not suggest the involvement of major genes, since there was no clear segregation between resistant and susceptible categories in either the F1 or F2 generations. << The Del Norte clone of Fragaria chiloensis (L.) Duchesne was the most resistant, based on ratings of visible leaf damage. 0000007893 00000 n /ExtGState 7 0 R In the greenhouse, all treatments equivalently reduced the number of T. urticae below control. The oviposition and development of the two-spotted spider mite were endobj The experiments were conducted on Paraguay tea leaf discs infested with one adult female mite/disc, incubated in a climate chamber (25 +/- 1 degrees C, 14h photophase) for five days. (1982) measured a 10% reduction in photo-synthesis ofwinter-grown strawberry plants following 2250 mite days per leaflet, but Hall and Ferree (1975) reported a 26% reduction in photosynthesis of greenhouse-grown ap-ple trees following only 135 mite days per leaf. Strawberry plants are often heavily infested and suffer severe damage by T. urticae (Sato et al., 2001). Festival was classified as moderately resistant, Aromas and Kp were moderately susceptible, and the others were intermediate. testes, a cultivar "Pink Snow" apresentou maior abundância significativa. Mite population peak occurred in the dry season (June to September) and control measures recommended for integrated production systems and organic were efficient working jointly to reduce the pest population. 10 0 obj 2006, Naher et al. Results for the varieties correlated closely with field experience of commercial growers: 'Shasta' and similar highly susceptible clones were highly susceptible in the tests, and 'Lassen' and similar less susceptible clones were significantly less susceptible; consistent with this, mite buildup was less on Lassen derivatives than on Shasta derivatives. Fecundity of newly molted and mated females was recorded during the first 10 days of oviposition. Em todas as variedades o maior número de T. urticae Two experiments were conducted in Florida to determine the tolerance of 4 strawberry cultivars to Tetranychus urticae Koch by comparing populations of mites on plants treated or not treated with cyhexatin for mite control. other countries. En conditions contrôlées, plus de 99%, In strawberry greenhouses in La Plata (Buenos Aires, Argentina), Tetranychus urticae is a major pest and Neoseiulus californicus is its most important established phytoseiid predator. Highly susceptible clones appear to be more pubescent than those that are less susceptible. The number of eggs laid and the time for development from egg to adult were similar overall on newly-propagated plants and one year old plants that had experienced dormancy and chilling. Mite counts made in the field substantiated the greenhouse findings. How to realize the potential of the predatory mite Phytoseiulus macropilis to control two-spotted spider-mites in strawberry? The resistance of Del Norte was inherted by its progeny when crossed with Siletz, WSU 1019, and 'Olympus.'. 0000012489 00000 n 2012). ‘Seascape,’ immature survivorship was higher, but no difference was compared with whole-plot treatments of bifenazate or N. californicus to determine whether T. urticae could be effectively managed in field-grown strawberry using only site-specific tactics.
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