The DNA staining method also has the potential to reveal other endosymbiotic bacteria, but none were observed within ovaries. The role of the different reproductive modes in T. tabaci populations in New York onion fields remains unclear. Adult females live only one or two weeks in warm weather, but can survive for many weeks at cool temperatures, which is of importance during winter. S.M. Karr The body of the adult is 0.8 to 1.2 mm (0.031-0.047 inch) long and yellowish-gray to dark-gray in color. Both sets of primers can detect Wolbachia from the major groups found in arthropods. Grafius Alternatively, an external factor may not elicit male-producing forms of parthenogenesis in populations of T. tabaci. Both nymphs and adults suck out epidermal cells, and sometimes mesophyll cells.

Between late June and early October, thrips larvae were randomly sampled from 20 to 50 onion plants within a 1-ha area in each field. As a control for DNA template quality, polymerase chain reaction (PCR) was also performed using primers for cytochrome oxidase (COI) LCOI1490 (GGTCAACAAATCATAAAGATATTGG) and HCO2198 (GGTCAACAAATCATAAAGATATTGG) (Herbert et al.

This observation suggests that a factor or factors elicit the production of males in onion fields and not in other crops. Log in, The active substances, venom, poison and saliva, Flea control in the surrounding environment, If the European pigeon ticks are not controlled, Infection and the spreading between animals. Each thelytokous virgin produced an average of 11.0 offspring (range: 4.4-24.4; Table 1). However, moderate to high levels of survival of T. tabaci after exposure to a low rate of methomyl in laboratory assays has been shown, suggesting that genes for resistance to carbamates are present in these populations (A.M.S., unpublished data). S.Y.

To ensure that test animals would be virgins, pupae were removed from the boxes and placed singly into ventilated, plastic petri dishes (5 cm in diameter). Although at least one additional bacterium has been shown to induce parthenogenesis in arthropods (Zchori-Fein et al. 1999).

T.L. The eggs are inserted into soft plant tissues, including flowers, leaves, stems and fruit. Similarly, high temperature did not affect sex allocation ratios in either thelytokous or male-producing populations. This procedure was repeated to create a colony for the third generation. A total of 70 thelytokous, 15 arrhenotokous, and 23 deuterotokous T. tabaci were tested. Thus, New York onion growers will need to continue relying on TIBS results for estimating T. tabaci's susceptibility to insecticides.

Entomologists have described approximately 6,000 species. In male-producing populations, arrhenotokous and deuterotokous individuals averaged 32.2% (range: 2-95%) and 15.1% (range: 3-33%) of the total, respectively (Table 1).

Temperature had no effect on parthenogenesis, at least over the range of temperatures examined (18-29°C; Tables 3 and 4). Understanding these reproductive modes may provide insight into certain biological attributes of a population such as the rapidity in which a population could develop insecticide resistance. 2005). Male-producing populations of T. tabaci were not more resistant to lambda-cyhalothrin or more tolerant to methomyl compared with thelytokous populations. Wolbachia were not detected in T. tabaci. E. C.R. Plate Sex determination of adult thrips was the criterion used to identify the mode of reproduction for T. tabaci populations in onion (Suomalainen and Saura 1993). In thrips, Wolbachia infection causes Franklinothrips vespiformis (Crawford) and Taeniothrips inconsequens (Uzel) to become thelytokous, whereas in the absence of Wolbachia they are arrhenotokous (Moritz 1997, Arakaki et al. Reproductive modes in thrips and the cytological mechanisms involved in sex determination are not well understood (Moritz 1997). Thelytokous and male-producing populations were encountered annually and co-existed in eastern New York (i.e., Orange County) and central and western New York (i.e., Orleans, Oswego, Wayne, and Yates Counties). Samples from which no COI amplicons were obtained were excluded. Onion field in which larvae (future virgin females) were collected. Y. Hurst Lasting infestations will cause leaves to curl, turn brown and drop. The average number of offspring produced per T. tabaci virgin was nearly identical for each reproductive mode (Table 1). Because only two populations were evaluated in this study, additional populations should be examined before temperature is dismissed as a potential parthenogenesis-altering factor.

2A). and Aspergillus spp.. Thrips tabaci reproduces entirely parthenogenetically; males are very rare.

Three different PCRs were performed concurrently on each sample using the three primer pairs.

Nault Therefore, the possibility existed that populations containing a high proportion of thelytokous individuals could be more susceptible than those containing a high proportion of arrhenotokous and deuterotokous individuals.


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