scholarly journals Implications of oöcyte resorption bodies in the ovarioles of Argentine stem weevil,Listronotus bonariensis(Coleoptera: Curculionidae)

1983 ◽  
Vol 10 (1) ◽  
pp. 111-115 ◽  
Author(s):  
S.L. Goldson
Keyword(s):  
Listronotus Bonariensis ◽  
Oocyte Resorption

Listronotus bonariensis. [Distribution map].

1998 ◽  
Author(s):  
Keyword(s):  
New Zealand ◽  
South America ◽  
Geographical Distribution ◽  
New South ◽  
South Australia ◽  
Distribution Map ◽  
South Wales ◽  
Pasture Grasses ◽  
Listronotus Bonariensis ◽  
New Distribution

Abstract A new distribution map is provided for Listronotus bonariensis (Kuschel) Coleoptera: Curculionidae Attacks Lolium spp. and other pasture grasses and cereals. Information is given on the geographical distribution in SOUTH AMERICA, Argentina, Bolivia, Brazil, Chile, Uruguay, OCEANIA, Australia, New South Wales, South Australia, Tasmania, Victoria, Western Australia, New Zealand.

Role of ovarian follicle cells in vitellogenesis and oocyte resorption inCapitella sp. I (Polychaeta)

1984 ◽  
Vol 79 (2) ◽  
pp. 133-144 ◽  
Author(s):  
K. J. Eckelbarger ◽  
P. A. Linley ◽  
J. P. Grassle
Keyword(s):  
Ovarian Follicle ◽  
Follicle Cells ◽  
Oocyte Resorption

scholarly journals Tall fescue use on dairy farms

1997 ◽  
pp. 163-167 ◽  
Author(s):  
G.D. Milne ◽  
R. Shaw ◽  
R. Powell ◽  
B. Pirie ◽  
J. Pirie
Keyword(s):  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Animal Health ◽  
Dairy Farms ◽  
Moisture Stress ◽  
Dairy Farmers ◽  
Costelytra Zealandica ◽  
Listronotus Bonariensis ◽  
Summer Growth

Tall fescue (Festuca arundinacea Schreb.) is now well proven on New Zealand dairy farms as a pasture species capable of producing high levels of milk production. Compared with perennial ryegrass (Lolium perenne) it offers benefits of higher annual and summer growth, higher clover contents in pasture, higher green leaf to stem ratios in summer, reduced plant pulling, better animal health, grass grub (Costelytra zealandica) and Argentine stem weevil (Listronotus bonariensis) tolerance, tolerance of wet soils, and drought tolerance and growth. Tall fescue can be recommended for dairy farmers in areas where summer growth and quality of ryegrass is reduced by moisture stress or high temperatures, and for those willing to adjust their grazing and establishment practices to suit tall fescue. Keywords: dairy farms, Festuca arundinacea, tall fescue

Endophytic Fungi in Indigenous Australasian Grasses Associated with Toxicity to Livestock

1998 ◽  
Vol 64 (2) ◽  
pp. 601-606 ◽  
Author(s):  
Christopher O. Miles ◽  
Margaret E. di Menna ◽  
Surrey W. L. Jacobs ◽  
Ian Garthwaite ◽  
Geoffrey A. Lane ◽  
...  
Keyword(s):  
New Zealand ◽  
Perennial Ryegrass ◽  
High Performance ◽  
Ergot Alkaloids ◽  
Enzyme Linked Immunosorbent Assay ◽  
Herbarium Specimens ◽  
Causative Agents ◽  
Listronotus Bonariensis ◽  
First Time ◽  
Slow Growing

ABSTRACT Grazing of Echinopogon spp. by livestock in Australia has caused symptoms similar to those of perennial ryegrass staggers. We observed an endophytic fungus in the intercellular spaces of the leaves and seeds of New Zealand and Australian specimens of Echinopogon ovatus. Culture of surface-sterilized seeds from New Zealand specimens yielded a slow-growing fungus. An examination in which immunoblotting and an enzyme-linked immunosorbent assay (ELISA) were used indicated that E. ovatus plants from Australia and New Zealand were infected with fungi serologically related toNeotyphodium lolii (the endophyte of perennial ryegrass) and other Epichloe and Neotyphodium spp. endophytic in pooid grasses. No lolitrems (the indole–diterpenoids implicated as the causative agents of perennial ryegrass staggers), peramine analogs, or ergot alkaloids were detected in the infected specimens by high-performance liquid chromatography or ELISA. However, in endophyte-infected E. ovatus plants from New Zealand, analogs of the indole–diterpenoid paxilline (thought to be a biosynthetic precursor of the lolitrems and related tremorgens) were detected by ELISA, and N-formylloline was detected by gas chromatography. Endophyte-free specimens of New Zealand E. ovatus did not contain detectable paxilline analogs or lolines and were more palatable than infected specimens to adults of the pasture pest Listronotus bonariensis (Argentine stem weevil). Hyphae similar to those of the E. ovatus endophyte were also found in herbarium specimens of Echinopogon nutans var. major, Echinopogon intermedius, Echinopogon caespitosus, andEchinopogon cheeli. This appears to be the first time that an endophytic Neotyphodium species has been identified in grasses endemic to New Zealand or Australia.

Microsatellites and 16S sequences corroborate phenotypic evidence of trans-Andean variation in the parasitoidMicroctonus hyperodae(Hymenoptera: Braconidae)

2005 ◽  
Vol 95 (4) ◽  
pp. 289-298 ◽  
Author(s):  
L.M. Winder ◽  
C.B. Phillips ◽  
C. Lenney-Williams ◽  
R.P. Cane ◽  
K. Paterson ◽  
...  
Keyword(s):  
Andes Mountains ◽  
South American ◽  
The South ◽  
The Andes ◽  
16S Gene ◽  
Pasture Grasses ◽  
Geographical Populations ◽  
Listronotus Bonariensis ◽  
Microctonus Hyperodae ◽  
Chilean Populations

AbstractEight South American geographical populations of the parasitoidMicroctonus hyperodaeLoan were collected in South America (Argentina, Brazil, Chile and Uruguay) and released in New Zealand for biological control of the weevilListronotus bonariensis(Kuschel), a pest of pasture grasses and cereals. DNA sequencing (16S, COI, 28S, ITS1, β-tubulin), RAPD, AFLP, microsatellite, SSCP and RFLP analyses were used to seek markers for discriminating between the South American populations. All of the South American populations were more homogeneous than expected. However, variation in microsatellites and 16S gene sequences corroborated morphological, allozyme and other phenotypic evidence of trans-Andes variation between the populations. The Chilean populations were the most genetically variable, while the variation present on the eastern side of the Andes mountains was a subset of that observed in Chile.

Linear patterns of dispersal and build up of the introduced parasitoidMicroctonus hyperodae(Hymenoptera: Braconidae) in Canterbury, New Zealand

1999 ◽  
Vol 89 (4) ◽  
pp. 347-353 ◽  
Author(s):  
S.L. Goldson ◽  
J.R. Proffitt ◽  
M.R. McNeill ◽  
D.B. Baird
Keyword(s):  
New Zealand ◽  
Linear Model ◽  
Generalized Linear Model ◽  
Release Site ◽  
South American ◽  
Inhibitory Effects ◽  
The South ◽  
Listronotus Bonariensis ◽  
The Mean ◽  
One Year

AbstractThe dispersal ofMicroctonus hyperodaeLoan, an introduced parasitoid of the South American grassland pestListronotus bonariensisKuschel, was measured in Canterbury, New Zealand. Considering all directions, the mean annual dispersive increment was 1.9 ± 0.9 km year–1as measured in the winters of 1993, 1994 and 1995. The parasitoid’s ground distribution suggested that its movement was biased towards the south-west indicating probable wind-borne dispersal. The overall relatively low rate of dispersal was thought to be related to the inhibitory effects ofM. hyperodaeparasitism onL. bonariensisflight. A generalized linear model fitted to percentage ofL. bonariensisparasitized took a simple form, with a quadratic increase in weevil infection, that with time, gradually decreased. The build-up of parasitism at the release site was significantly greater than the rates at the other sites measured in this study (P< 0.001) with a ratio of release site: dispersal site rates of 1.33: 1. The simplicity of the fitted generalized linear model indicated remarkable uniformity in both parasitism build-up and dispersal from one year to the next; this finding indicated that all dispersal was ‘natural’ and unassisted by human activity. Despite such modest dispersal rates, by the winter of 1996, five years after its release, the parasitoid had spread geometrically over an area ofc. 140 km2.

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