Prevention of virus epidemics by a crop-free period in the arava region of Israel

Ucko, Orna; Cohen, S.; Ben-Joseph, Rachel

doi:10.1007/bf02981446

Cited by 36 publications

(19 citation statements)

References 4 publications

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“…Eradication of potential host plants is relevant in isolated areas, especially in arid regions where natural vegetation is poor. The phytosanitation approach was successfully implemented by imposing a crop-free period of several weeks, thus decreasing the whitefly populations as well as the inoculum sources (Hilje et al 2001;Ucko et al 1998). …”

Section: Phytosanitationmentioning

confidence: 99%

Management of Bemisia tabaci Whiteflies

Horowitz

Antignus

Gerling

2011

The Whitefly, Bemisia Tabaci (Homoptera: Aleyrodidae) Interaction With Geminivirus-Infected Host Plants

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This review presents and discusses the merits of the methodologies available for implementing integrated pest management (IPM) of B. tabaci populations: namely, chemical control with selective insecticides, biological control, crop plant resistance and physical/mechanical methods. Insecticides, by their poisonous nature, are often harmful to natural enemies and therefore, disruptive to overall pest management. However, the more modern materials that are effective for B. tabaci control are relatively specific to the target pests, and therefore are less harmful to natural enemies and the environment; consequently, they are also more suitable for integrative combination with other methods. Natural enemies, by themselves, usually do not form a suitable solution of B. tabaci-caused problems. However, their occurrence and use greatly reduces the pest's populations. Since viral plant diseases transmitted by B. tabaci are not curable, the principal tactics for their management should be based on prevention of transmission by physical-mechanical methods and/or on utilization of host-plant resistance. The correct implementation of natural enemies will help to reduce whitefly numbers, which can then be more readily managed using cultural and, only if necessary, chemical countermeasures.

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Section: Phytosanitationmentioning

confidence: 99%

Management of Bemisia tabaci Whiteflies

Horowitz

Antignus

Gerling

2011

The Whitefly, Bemisia Tabaci (Homoptera: Aleyrodidae) Interaction With Geminivirus-Infected Host Plants

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“…ToLCD/TYLCD is a large constraint, especially during the dry season, when the whitefly populations are highest [54]. The implementation of host-free periods has been a successful way for control of begomovirus infections of tomato, for example, in Israel and the Dominican Republic [88,89]. A host-free period with no tomato or solanaceous crop is also used in some areas of West Africa with a high incidence of ToLCD/TYLCD [78,90].…”

Section: Agricultural Practicesmentioning

confidence: 99%

Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa

et al. 2015

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Vegetables play a major role in the livelihoods of the rural poor in Africa. Among major constraints to vegetable production worldwide are diseases caused by a group of viruses belonging to the genus Begomovirus, family Geminiviridae. Begomoviruses are plant-infecting viruses, which are transmitted by the whitefly vector Bemisia tabaci and have been known to cause extreme yield reduction in a number of economically important vegetables around the world. Several begomoviruses have been detected infecting vegetable crops in West and Central Africa (WCA). Small single stranded circular molecules, alphasatellites and betasatellites, which are about half the size of their helper begomovirus genome, have also been detected in plants infected by begomoviruses. In WCA, B. tabaci has been associated with suspected begomovirus infections in many vegetable crops and weed species. Sequencing of viral genomes from crops such as okra resulted in the identification of two previously known begomovirus species (Cotton leaf curl Gezira virus and Okra yellow crinkle virus) as well as a new recombinant begomovirus species (Okra leaf curl Cameroon virus), a betasatellite (Cotton leaf curl Gezira betasatellite) and new alphasatellites. Tomato and pepper plants with leaf curling were shown to contain isolates of new begomoviruses, collectively referred to as West African tomato-infecting begomoviruses (WATIBs), new alphasatellites and betasatellites. To study the potential of weeds serving as begomovirus reservoirs, begomoviruses and satellites in the weed Ageratum conyzoides were characterized. Sequence analyses showed that they were infected by isolates of a new begomovirus (Ageratum leaf curl Cameroon virus) that belong to the WATIBs group, a new betasatellite (Ageratum leaf curl Cameroon betasatellite), an alphasatellite and two types of defective recombinants between a begomovirus and an alphasatellite. Putative recombinations were detected in begomovirus genomes for all four plant species studied, indicating that recombination is an important mechanism for their evolution. A close relationship between the begomoviruses infecting pepper and tomato and A. conyzoides and the detection of the same alphasatellite in them support the idea that weeds are important reservoirs for begomoviruses and their satellites. With this high diversity, recombination potential and transmission by B. tabaci, begomoviruses and ssDNA satellites pose a serious threat to crop production in West and Central Africa.

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“…This is practically difficult to implement in cucurbit crops due to the number of cucurbit types cultivated and the diversity of growing conditions. However, a crop-free period from mid-June to midJuly considerably reduced incidence of aphid-and whitefly-transmitted viruses in the Arava Valley in Israel (Ucko, Cohen, & Ben-Joseph, 1998). A similar one-month cucurbit-free period was suggested to limit whitefly-borne viruses in Southern Spain ( Janssen et al, 2003).…”

Section: Avoiding Overlapping Cropsmentioning

confidence: 97%