Planococcus citri (citrus mealybug).

2021 ◽  
Author(s):  
Gillian Watson
Keyword(s):  
Plant Material ◽  
Plant Virus ◽  
Host Plants ◽  
Planococcus Citri ◽  
Virus Diseases ◽  
Citrus Mealybug ◽  
Fresh Plant Material ◽  
The World ◽  
Cacao Swollen Shoot Virus ◽  
Human Transport

Abstract Planococcus citri is a highly polyphagous, adaptable mealybug that can feed on many host plants in a variety of conditions, and can reproduce rapidly. It has been reported on over 200 host-plant species belonging to 191 genera and 82 families, and can seriously damage many crops, particularly citrus and glasshouse tomatoes. It is known to transmit some plant virus diseases like Cacao swollen shoot virus. The mealybug is of Old World origin, but its polyphagy has facilitated its spread about the world by human transport of infested plants over many years, and it is now established in in all the temperate and tropical zoogeographic regions, and lives under glass in higher latitudes. Its small size and cryptic habits makes it difficult to detect and identify at plant quarantine inspection. The increase in international trade in fresh plant material in recent years is facilitating its continued spread.

Ferrisia virgata (striped mealybug).

2021 ◽  
Author(s):  
Gillian Watson
Keyword(s):  
International Trade ◽  
Plant Material ◽  
Host Plants ◽  
Black Pepper ◽  
Tropical Fruit ◽  
Field Crops ◽  
Fresh Plant Material ◽  
Tropical Conditions ◽  
The World ◽  
Human Transport

Abstract Ferrisia virgata is a highly polyphagous mealybug. It reproduces quite rapidly in tropical conditions, but it tolerates subtropical and to some extent temperate conditions too. It has been reported on host-plants belonging to over 203 genera in 77 families, and can damage many crops, particularly tropical fruit, nut and spice crops and field crops like soybean and tomato. It is known to transmit plant badnavirus diseases of cocoa and black pepper. It is of Neotropical origin and spread around the world in only about 10 years after being first described from Jamaica. Its polyphagy has facilitated its spread by human transport of infested plants, and it is now established in all the subtropical and tropical zoogeographic regions. Its small size and cryptic habits make it difficult to detect and identify at plant quarantine inspection. The increase in international trade in fresh plant material in recent years is likely to facilitate its continued spread.

Search mode for rapid detection of virus particles

1991 ◽  
Vol 49 ◽  
pp. 286-287
Author(s):  
O. E. Bradfute
Keyword(s):  
Electron Microscopy ◽  
Rapid Detection ◽  
Plant Virus ◽  
Low Dose ◽  
Search Mode ◽  
Virus Diseases ◽  
Virus Particles ◽  
Focus Image ◽  
Time Required ◽  
Rapid Switching

Electron microscopy is frequently used in preliminary diagnosis of plant virus diseases by surveying negatively stained preparations of crude extracts of leaf samples. A major limitation of this method is the time required to survey grids when the concentration of virus particles (VPs) is low. A rapid survey of grids for VPs is reported here; the method employs a low magnification, out-of-focus Search Mode similar to that used for low dose electron microscopy of radiation sensitive specimens. A higher magnification, in-focus Confirm Mode is used to photograph or confirm the detection of VPs. Setting up the Search Mode by obtaining an out-of-focus image of the specimen in diffraction (K. H. Downing and W. Chiu, private communications) and pre-aligning the image in Search Mode with the image in Confirm Mode facilitates rapid switching between Modes.

scholarly journals Factors affecting the amount of infection obtained by aphis transmission of the virus Hy. III

1936 ◽  
Vol 226 (540) ◽  
pp. 457-489 ◽  
Keyword(s):  
Plant Virus ◽  
Host Plants ◽  
Suitable Host ◽  
Factors Affecting

Much of the information which can be obtained about a plant virus agent is ultimately derived from the quantity as well as the type of the infections resulting from inoculations to suitable host plants. The number ofinfections obtained does not depend solely on the nature of the particular virus concerned. It is dependent on other variable factors, such as the efficiency of the means of infection introducing the virus, the susceptibility of the plants receiving it, and the concentration of the virus in the source from which it was obtained. In this paper a'n attempt has been made to estimate the effect of some of these variables on infection by insects.

THE SPATIAL DISTRIBUTION OF INSECT-BORNE PLANT-VIRUS DISEASES

1949 ◽  
Vol 36 (4) ◽  
pp. 475-482 ◽  
Author(s):  
P. H. GREGORY ◽  
D. R. READ
Keyword(s):  
Spatial Distribution ◽  
Plant Virus ◽  
Virus Diseases

scholarly journals Stochastic Modeling of Plant Virus Propagation with Biological Control

Mathematics ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 456
Author(s):  
Benito Chen-Charpentier
Keyword(s):  
Differential Equations ◽  
Plant Virus ◽  
Propagation Model ◽  
Gillespie Algorithm ◽  
Virus Diseases ◽  
Virus Propagation ◽  
Healthy Environment ◽  
Fundamental Part ◽  
Negative Effect ◽  
Delay Differential

Plants are vital for man and many species. They are sources of food, medicine, fiber for clothes and materials for shelter. They are a fundamental part of a healthy environment. However, plants are subject to virus diseases. In plants most of the virus propagation is done by a vector. The traditional way of controlling the insects is to use insecticides that have a negative effect on the environment. A more environmentally friendly way to control the insects is to use predators that will prey on the vector, such as birds or bats. In this paper we modify a plant-virus propagation model with delays. The model is written using delay differential equations. However, it can also be expressed in terms of biochemical reactions, which is more realistic for small populations. Since there are always variations in the populations, errors in the measured values and uncertainties, we use two methods to introduce randomness: stochastic differential equations and the Gillespie algorithm. We present numerical simulations. The Gillespie method produces good results for plant-virus population models.

Acyrthosiphon pisum. [Distribution map].

1982 ◽  
Author(s):  
Keyword(s):  
South Africa ◽  
Saudi Arabia ◽  
Host Plants ◽  
Pacific Islands ◽  
Acyrthosiphon Pisum ◽  
Distribution Map ◽  
Virus Diseases ◽  
Yemen Arab Republic ◽  
New Distribution ◽  
Distribution In Europe

Abstract A new distribution map is provided for Acyrthosiphon pisum (Harris) (Macrosiphum pisum(Harris), M. onobrychis(Boy.)) (Hemipt., Aphididae) (Pea Aphis). Host Plants: Pea, beans and other legumes. A vector of virus diseases. Information is given on the geographical distribution in EUROPE (excl. USSR), Albania, Austria, Belgium, Britain, Bulgaria, Czechoslovakia, Denmark, Faeroe Islands, Finland, France, Germany, Greece, Hungary, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Romania, Sardinia, Spain, Sweden, Switzerland, Yugoslavia, ASIA (excl. USSR), Afghanistan, China, Cyprus, India, Iran, Iraq, Israel, Jammu, Japan, Jordan, Lebanon, Nepal, Pakistan, Philippines, Saudi Arabia, Sikkim, Syria, Turkey, Yemen Arab, Republic, USSR, AFRICA, Algeria, Egypt, Ethiopia, Kenya, Libya, Madeira, Malawi, Morocco, South Africa, Sudan, Tanzania, Uganda, Zambia, Zimbabwe, AUSTRALASIA and PACIFIC ISLANDS, Australia, Hawaii, New Zealand, NORTH AMERICA, Canada, Mexico, USA, SOUTH AMERICA, Argentina, Bolivia, Brazil, Chile, Peru, Uruguay, Venezuela.

The Current Understanding on Plant Virus Diseases in Tasmania.

1983 ◽  
Vol 12 (2) ◽  
pp. 24 ◽  
Author(s):  
GR Johnstone ◽  
D Munro ◽  
PJ Sampson
Keyword(s):  
Plant Virus ◽  
Current Understanding ◽  
Virus Diseases

Inclusions in Diagnosing Plant Virus Diseases

2019 ◽  
pp. 101-128 ◽  
Author(s):  
J. R. Edwardson ◽  
R. G. Christie ◽  
D. E. Purcifull ◽  
M. A. Petersen
Keyword(s):  
Plant Virus ◽  
Virus Diseases
Sign in / Sign up

Export Citation Format

Share Document