The Biology and Main Causes of Changes in Numbers of the Rose Aphid, Macrosiphum Rosae (L.), On Cultivated Roses in South Australia.

1977 ◽  
Vol 25 (2) ◽  
pp. 269 ◽  
Author(s):  
DA Maelzer
Keyword(s):  
Computer Simulation ◽  
Population Dynamics ◽  
Natural Populations ◽  
South Australia ◽  
Flower Buds ◽  
Young Leaves ◽  
Macrosiphum Rosae ◽  
The Rose

In South Australia, M. rosae is anholocyclic on Rosa, reproducing parthenogentically and viviparously all year round. It feeds mainly on the young leaves and developing flower-buds of hybrid tea roses. The fate of a colony of aphids on a single bud is a function of temperature, rainfall, predation, the time for which the bud remains favourable for the aphids, and the influence of crowding on alatiform production and on dispersal of apterae by walking or dropping off. The numbers of aphids on cultivated hybrid tea roses in a rose garden had three peaks in spring-summer which coincided with three flushes of growth of the rose. The first peak, in spring, was the highest; thereafter numbers of aphids were relatively low, mainly because of predation by three species of native predators, namely the hemerobiid Micromus tasmaniae, the syrphid Melangyna viridiceps and the ladybird Leis conformis. The study was a prelude to computer simulation of the population dynamics of the aphid which will be used to investigate the problem of the regulation of density in natural populations of aphids.

The Growth and Voracity of Larvae of Leis Conformis (Boisd.) (Coleoptera: Coccinellidae) Fed on the Rose Aphid Macrosiphum Rosae (L.) (Homoptera: Aphididae) in the Laboratory.

1978 ◽  
Vol 26 (2) ◽  
pp. 293 ◽  
Author(s):  
DA Maelzer
Keyword(s):  
Pest Control ◽  
South Australia ◽  
Cumulative Number ◽  
Wet Weight ◽  
The Mean ◽  
Macrosiphum Rosae ◽  
The Rose

The ladybird Leis conformis is one of the commonest predators of the rose aphid, and of other aphids in South Australia. When fed a surfeit of M. rosae the mean weights of larvae during development could be described by the equation: y = 0.45 exp[(O.0313t-0.2751)x] where t is temperature in degrees Celsius such that 15 < t < 29.2, and x is time in days, such that y < 40.6 mg. The mean weights could also be described by: y = exp (0.0347x-0.8551), with x in day-degrees above 10�C. The voracity of larvae could be described in third-instar aphid equivalents (TIES) by: y = exp(0.0347x+ 0.6219) where y is cumulative number of TIES eaten, and x is less than 131.4 day-degrees. The TIE units used to convert predator wet weight to aphid units eaten were based on the numbers of aphids of each instar that had to be eaten for a predator larva to gain one milligram of wet weight. It is suggested that the voracities of different ladybirds feeding on different aphids can be compared when voracity is expressed as the cumulative number of aphids eaten per stadium. The quantification of voracity in the field, and the possible use of L. conformis for pest control, are briefly discussed.

scholarly journals Some bioecological aspects of the rose aphid, Macrosiphum rosae (Hemiptera: Aphididae) and its natural enemies

2016 ◽  
Vol 8 (1) ◽  
pp. 74-88
Author(s):  
Mohsen Mehrparvar ◽  
Seyed Mozaffar Mansouri ◽  
Bijan Hatami
Keyword(s):  
Population Dynamics ◽  
Natural Enemies ◽  
Economic Damage ◽  
Host Alternation ◽  
Macrosiphum Rosae ◽  
The Rose ◽  
Seasonal Population ◽  
Sexual Form ◽  
Seasonal Population Dynamics

Abstract The rose aphid, Macrosiphum rosae, is one of the most important pests on roses in the world and it causes economic damage. In this study, biology, seasonal population dynamics, and status of natural enemies of the rose aphid were studied. Seasonal population dynamics was studied by randomly sampling 10 shoots every week in two locations of Isfahan, Iran. Rose aphid with a high population density, both in spring (April and May) and in autumn (November), was observed on roses. The results showed that the rose aphid overwinters as parthenogenetic females and nymphs. This aphid migrates to a secondary host, Dipsacus fullonum (Dipsacaceae), in summer due to poor food quality of rose plants. Since sexual form and egg of the rose aphid were not observed in Isfahan, it is probably anholocyclic species with host alternation in this area. Natural enemies of the rose aphid include four species of Coccinellidae, three species of Syrphidae, two species of Chamaemyiidae, one species of Chrysopidae, a few species of Anthocoridae and Miridae, and one species of Cantharidae. One species of ectoparasite mite of Erythraeidae was also collected. In addition, four species of parasitoid wasps, Braconidae, were collected.

Computer Simulation of Boophilus Cattle Tick (Acari: Ixodidae) Population Dynamics

1991 ◽  
Vol 28 (2) ◽  
pp. 223-240 ◽  
Author(s):  
G. A. Mount ◽  
D. G. Haile ◽  
R. B. Davey ◽  
L. M. Cooksey
Keyword(s):  
Computer Simulation ◽  
Population Dynamics ◽  
Cattle Tick

scholarly journals NOTES ON THE EGG AND YOUNG LARVA OF ALARIA FLORIDA

1871 ◽  
Vol 3 (4) ◽  
pp. 76-76 ◽  
Author(s):  
W. Saunders
Keyword(s):  
Young Larva ◽  
Flower Buds ◽  
Flower Stalk ◽  
Evening Primrose ◽  
Young Leaves

On the 4th of July I found a number of eggs of this beautiful moth on the evening primrose, Œnothera Lamarckiana. They were found attached to the stalks of the young flower buds; to the sides of the calyx of the flower, and also to the young leaves at their base. The eggs were quite firmly fastened among the long stout hairs with which the cuticle of the calyx and flower stalk is covered.

Population Dynamics of White Sharks in Spencer Gulf, South Australia

1996 ◽  
pp. 401-414 ◽  
Author(s):  
WESLEY R. STRONG ◽  
DONALD R. NELSON ◽  
BARRY D. BRUCE ◽  
RICHARD D. MURPHY
Keyword(s):  
Population Dynamics ◽  
South Australia

Regional divergence and inbreeding in Eucalyptus cladocalyx (Myrtaceae)

2003 ◽  
Vol 51 (4) ◽  
pp. 393 ◽  
Author(s):  
M. W. McDonald ◽  
M. Rawlings ◽  
P. A. Butcher ◽  
J. C. Bell
Keyword(s):  
Genetic Diversity ◽  
Natural Populations ◽  
South Australia ◽  
Natural Distribution ◽  
Flinders Ranges ◽  
Outcrossing Rates ◽  
Low Levels ◽  
Western Victoria ◽  
Ornamental Species ◽  
Regional Divergence

Eucalyptus cladocalyx F.Muell. is a widely cultivated tree in dryland southern Australia. It is grown for firewood, timber production and as a windbreak and ornamental species. Natural populations of E. cladocalyx are endemic to South Australia where they occur in three disjunct regions. This study assessed the mating system and patterns of genetic diversity in natural populations of E. cladocalyx by using allozymes. Populations had relatively low levels of genetic diversity (HE = 0.148) and high levels of genetic divergence (θ = 0.26) among populations, similar to other regionally distributed eucalypts. Populations clustered into three distinct groups, which corresponded to its disjunct natural distribution. Genetic differentiation among populations and between regions was highly significant. Relatively high levels of inbreeding (tm = 0.57) were detected in natural populations of E.�cladocalyx. Outcrossing rates were highly variable among families, ranging from 0 to 100%. One-third of families from four populations had outcrossing rates that were not significantly different from zero. The origins of three commercially significant, cultivated stands of E. cladocalyx were also assessed. Allozyme profiles of cultivated stands from Wail and Lismore in western Victoria suggested origins in the Wirrabara region of the southern Flinders Ranges, while a cultivated stand of E. cladocalyx var. nana Hort. ex Yates had an allozyme profile consistent with origins in the Eyre Peninsula region. The results are discussed in relation to the species' morphological variation, biogeography and the implications for its domestication and conservation.

scholarly journals Computer simulation of population dynamics inside the urban environment

2017 ◽  
Vol 936 ◽  
pp. 012023
Author(s):  
A.S. Andreev ◽  
I.N. Inovenkov ◽  
E.Yu. Echkina ◽  
V.V. Nefedov ◽  
L.S. Ponomarenko ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Population Dynamics ◽  
Urban Environment

Anarsia achrasella sp.n. (Lepidoptera: Gelechiidae) on sapodilla (Achras zapota) in northern India and Pakistan

1981 ◽  
Vol 71 (4) ◽  
pp. 617-619 ◽  
Author(s):  
J. D. Bradley
Keyword(s):  
Wing Pattern ◽  
Flower Buds ◽  
Northern India ◽  
Young Leaves ◽  
Anarsia Achrasella

AbstractA gelechiid moth whose larvae attack the flower buds and young leaves of sapodilla (Achras zapota), known also as chicle gum, chiko or naseberry, in northern India and Pakistan is described and named Anarsia achrasella sp.n. Wing pattern, labial palpal and genitalic features of both sexes of the adult are figured, and the species is differentiated from the closely related Afrotropical A. pinnata Meyr.

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