Host-Range Extension by Native Parasitoids to Weed Biocontrol Agents Introduced to South Africa

1995 ◽  
Vol 5 (2) ◽  
pp. 297-302 ◽  
Author(s):  
M.P. Hill ◽  
P.E. Hulley
Keyword(s):  
South Africa ◽  
Host Range ◽  
Biocontrol Agents ◽  
Range Extension ◽  
Weed Biocontrol ◽  
Native Parasitoids

Chaetomium strumarium. [Descriptions of Fungi and Bacteria].

2006 ◽  
Author(s):  
D. W. Minter
Keyword(s):  
South Africa ◽  
Saudi Arabia ◽  
Great Britain ◽  
The Netherlands ◽  
Host Range ◽  
Geographical Distribution ◽  
Canary Islands ◽  
Democratic Republic ◽  
Democratic Republic Of Congo ◽  
Horticultural Crops

Abstract C. strumarium is described and illustrated. Information on diseases caused by C. strumarium, host range (field and horticultural crops, trees, dung, man and artefacts), geographical distribution (Algeria, Canary Islands, Democratic Republic of Congo, Egypt, Gambia, Kenya, Namibia, Nigeria, South Africa, Tanzania, USA, India, Nepal, Pakistan, Thailand, Western Australia, Germany, Great Britain, the Netherlands, Cyprus, Israel, Kuwait and Saudi Arabia), and transmission is provided.

scholarly journals Safety in New Zealand weed biocontrol a nationwide pathogen survey for impacts on nontarget plants

2009 ◽  
Vol 62 ◽  
pp. 41-49 ◽  
Author(s):  
N.W. Waipara ◽  
J. Barton ◽  
L.A. Smith ◽  
H.M. Harman ◽  
C.J. Winks ◽  
...  
Keyword(s):  
New Zealand ◽  
Host Range ◽  
Plant Pathogens ◽  
Research Programme ◽  
Disease Symptoms ◽  
Weed Biocontrol ◽  
Disease Surveys ◽  
Rubus Species ◽  
Disease Damage ◽  
Range Testing

The accuracy of host range testing in weed biocontrol programmes using plant pathogens has been questioned prompting a research programme into the field safety record of pathogens used for weed biocontrol in New Zealand Nationwide disease surveys were conducted from 20002009 and focused on species closely related to target weeds and therefore potentially most at risk of attack These surveys identified pathogens associated with any disease symptoms observed on nontarget hosts Disease damage attributable to biocontrol agents was observed on two nontarget plants Pustules of the blackberry rust Phragmidium violaceum were found on the endemic Rubus species R cissoides (bush lawyer tataramoa) at one location This result was predicted from host range safety tests conducted prior to its arrival in New Zealand No nontarget damage was observed in the remaining case studies confirming to date that all biocontrol pathogens are highly host specific to their target weeds

Pratylenchus in sugarcane: a diminishing problem?

2021 ◽  
pp. 66-72
Author(s):  
Prabashnie Ramouthar
Keyword(s):  
South Africa ◽  
Life Cycle ◽  
Host Range ◽  
Geographical Distribution ◽  
Economic Importance ◽  
Nematode Management ◽  
Pratylenchus Brachyurus ◽  
Damage Symptoms

Abstract This chapter focuses on the economic importance, host range, geographical distribution, damage symptoms and biology and life cycle of Pratylenchus brachyurus, P. neglectus, P. scribneri and P. zeae infesting sugarcane in South Africa. Information on their interactions with other nematodes and pathogens, the efficacy and optimization of some recommended integrated nematode management programmes and future nematode research requirements are also presented.

Nematodes and cestodes of rodents in South Africa: baseline data on diversity and geographic distribution

2019 ◽  
Vol 94 ◽  
Author(s):  
A. Spickett ◽  
K. Junker ◽  
G. Froeschke ◽  
V. Haukisalmi ◽  
S. Matthee
Keyword(s):  
South Africa ◽  
Host Range ◽  
Geographic Distribution ◽  
Host Species ◽  
Baseline Data ◽  
Helminth Species ◽  
Rodent Species ◽  
Helminth Parasites ◽  
Gastrointestinal Helminths ◽  
Naturally Occurring

Abstract Currently, descriptive information on the host range and geographic distribution of helminth parasites associated with naturally occurring rodents in South and southern Africa is scant. Therefore, we embarked on a countrywide study to: (1) identify gastrointestinal helminths and their host range, and (2) provide baseline data on the geographic distribution of helminths across the country. Altogether, 55 helminth taxa were recovered from at least 13 rodent species (n = 1030) at 26 localities across South Africa. The helminth taxa represented 25 genera (15 nematodes, nine cestodes and one acanthocephalan). Monoxenous nematodes were the most abundant and prevalent group, while the occurrence of heteroxenous nematodes and cestodes was generally lower. The study recorded several novel helminth–host associations. Single-host-species infections were common, although multiple-host-species infections by helminth species were also recorded. Monoxenous nematodes and some cestodes were recovered countrywide, whereas heteroxenous nematodes were restricted to the eastern regions of South Africa. The study highlights the as yet unexplored diversity of helminth species associated with naturally occurring rodent species and provides initial data on their geographical distribution in South Africa.

scholarly journals Lack of genetic differentiation after host range extension argues for the generalist nature of Pityogenes chalcographus (Curculionidae: Scolytinae)

2011 ◽  
Vol 69 (3) ◽  
pp. 313-323 ◽  
Author(s):  
Coralie Bertheau ◽  
Stéphanie Bankhead-Dronnet ◽  
Carine Martin ◽  
François Lieutier ◽  
Géraldine Roux-Morabito
Keyword(s):  
Genetic Differentiation ◽  
Host Range ◽  
Range Extension ◽  
Pityogenes Chalcographus

scholarly journals First Screening of Entomopathogenic Nematodes and Fungus as Biocontrol Agents against an Emerging Pest of Sugarcane, Cacosceles newmannii (Coleoptera: Cerambycidae)

Insects ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 117 ◽  
Author(s):  
Marion Javal ◽  
John S. Terblanche ◽  
Desmond E. Conlong ◽  
Antoinette P. Malan
Keyword(s):  
South Africa ◽  
Biological Control ◽  
Chemical Control ◽  
Entomopathogenic Nematodes ◽  
Biocontrol Agents ◽  
Sugar Production ◽  
Biological Control Agents ◽  
Sugarcane Stalk ◽  
Reduce Sugar ◽  
Steinernema Yirgalemense

Cacosceles newmannii (Coleoptera: Cerambycidae) is an emerging pest of sugarcane in South Africa. The larvae of this cerambycid beetle live within the sugarcane stalk and drill galleries that considerably reduce sugar production. To provide an alternative to chemical control, entomopathogenic nematodes and fungus were investigated as potential biological control agents to be used in an integrated pest management system. The nematodes Steinernema yirgalemense, S. jeffreyense, Heterorhabditis indica, and different concentrations of the fungus Metarhizium pinghaense were screened for efficacy (i.e., mortality rate) against larvae of C. newmannii. The different biocontrol agents used, revealed a low level of pathogenicity to C. newmannii larvae, when compared to control treatments.

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