The Hawaiian psyllids (Psylloidea, Triozidae) feeding on Metrosideros (Myrtaceae) constitute a remarkable radiation of more than 35 species. This monophyletic group has diversified on a single, highly polymorphic host plant species, Metrosideros polymorpha. Eleven Metrosideros-feeding species included in the Insects of Hawaii by Zimmerman are redescribed, and an additional 25 new species are de...

Significant (P < 0.05) differences among galling and yields of 41 soybean cultivars and breeding lines were found when they were produced at a site infested with Meloidogyne incognita during 3 years of investigation. Over a period of 6 years of testing, 13 cultivars were identified as having a suitably low susceptibility to warrant their production in M. incognita infested soil.

Infection by root-knot nematode ( Meloidogyne spp.; RKN) leads to root galling and reduces the host plant’s ability take up water nutrients. Protected cropping systems, such as high tunnels, create conducive environments for RKN through increased soil temperatures more intensive crop production. In Kentucky, tunnel production has in past 10 years, with tomato being most cultivated crop. This co...

The effects of pre-planted marigold on tomato root-galling and multiplication of Meloidogyne incognita, M. javanica, M. arenaria, and M. hapla were studied. Marigold cultivars of Tagetes patula, T. erecta, T. signata, and a Tagetes hybrid all reduced galling and numbers of second-stage juveniles (J2) in subsequent tomato compared to the tomato-tomato control. All four Meloidogyne spp. reproduce...

Summary Root-knot nematode (RKN) is an important pathogen on vegetables; therefore, planting a non- or poor host cover crop following susceptible vegetable promising management option. This study builds upon previous studies and evaluates the variations in status of candidates for reducing reproduction RKN populations ( Meloidogyne incognita , M. arenaria javanica ) Georgia, USA, to shed light ...

Soil biodisinfestation is the process generated after incorporation of organic amendments followed by a plastic cover to control soilborne diseases. Among amendments, use agricultural by-products could be an interesting alternative as it promotes circular economy. In this study, beer bagasse and defatted rapeseed cake together with fresh cow manure were incorporated into soil (1.5, 0.5, 20 kg/m...

The overwhelming majority of automotive part manufacturing processes successfully process hot dip galvanized sheet metal. However, there were reported situations abrasive wear (galling), visible as narrow and long scratches, was observed on the surface formed parts. Investigations using a Slider On Sheet Tester (SOST) performed in order to determine conditions that lead scratch forming metal id...

The present study was conducted to evaluate the impact of amending soil with decomposed neem (Azadirachta indica) sawdust at different concentrations (0-100%) against inoculum levels (0-4000) root-knot nematode (Meloidogyne arenaria) infecting eggplants. Various physico-chemical properties increase as concentration (NSD) in field increases. Nevertheless, nitrogen content decreased a progressive...

Abstract Vanadis 6 cold work tool steel was vacuum austenitized, room temperature quenched, differently cryogenically treated (-75, -140 and -196 °C for different durations) double tempered, at temperatures of either 170 or 530 °C. Galling resistance assessed by pin-on-disc testing specimens against CuSn bronze, wide ranges sliding velocities loads. The obtained results show that cryogenic trea...