Articles
CONTROL OF THE SPREAD OF TWO NON-PERSISTENT APHID-BORNE VIRUSES IN LILIES
Article number
59_3
Pages
27 – 28
Language
Abstract
The three viruses most commonly reported in naturally infected members of the genus Lilium are tulip breaking virus (TBV) (syn. lily mottle virus), lily symptomless virus (LSV) and cucumber mosaic virus.
All are aphid-transmitted in the non-persistent manner and none has been found to be seed-borne in lilies.
Of the three viruses, only TBV and LSV were detected in field plots of lily seedlings from the Scottish Horticultural Research Institute’s plant breeding programme and the appearance of virus-like symptoms in many of these plants in the second year after planting suggested that virus spread was rapid.
In 1972 spread of TBV and LSV in these field plots of infected lilies was studied by exposing successive batches of Liliumformosanum bait plants.
Spread occurred throughout the test period of June to October but most infections occurred during July to August and more plants became infected with LSV than TBV. During 1973 two trials were made on the control of spread of TBV and LSV to L. formosanum bait plants.
In one trial two rows of 10 bait plants were grown in two adjacent areas within a plot of virus-infected lilies and the soil of one area (7 m x 7 m) was covered with aluminium-coated building paper.
Although the number of winged aphids caught in water-filled yellow pans on the mulched area was only c.1% of the numbers crapped on the untreated area, all bait plants in both areas became infected with TBV and/or LSV. The second trial in which the effect of a combination of a barley barrier crop and a spray of 1% emulsion of the mineral oil Albolineum (I.C.I. Ltd.) was tested under similar conditions gave more promising results.
In this trial five rows of 20 bait plants were planted between rows of infected plants and barley was grown as a barrier around 10 of the bait plants in each row in one half of the trial area.
The bait plants within the barrier and the infected plants in the rows next to them were sprayed weekly with the oil emulsion.
Of the 50 plants in the protected rows only two became infected as compared with 42 of the unprotected plants.
All are aphid-transmitted in the non-persistent manner and none has been found to be seed-borne in lilies.
Of the three viruses, only TBV and LSV were detected in field plots of lily seedlings from the Scottish Horticultural Research Institute’s plant breeding programme and the appearance of virus-like symptoms in many of these plants in the second year after planting suggested that virus spread was rapid.
In 1972 spread of TBV and LSV in these field plots of infected lilies was studied by exposing successive batches of Liliumformosanum bait plants.
Spread occurred throughout the test period of June to October but most infections occurred during July to August and more plants became infected with LSV than TBV. During 1973 two trials were made on the control of spread of TBV and LSV to L. formosanum bait plants.
In one trial two rows of 10 bait plants were grown in two adjacent areas within a plot of virus-infected lilies and the soil of one area (7 m x 7 m) was covered with aluminium-coated building paper.
Although the number of winged aphids caught in water-filled yellow pans on the mulched area was only c.1% of the numbers crapped on the untreated area, all bait plants in both areas became infected with TBV and/or LSV. The second trial in which the effect of a combination of a barley barrier crop and a spray of 1% emulsion of the mineral oil Albolineum (I.C.I. Ltd.) was tested under similar conditions gave more promising results.
In this trial five rows of 20 bait plants were planted between rows of infected plants and barley was grown as a barrier around 10 of the bait plants in each row in one half of the trial area.
The bait plants within the barrier and the infected plants in the rows next to them were sprayed weekly with the oil emulsion.
Of the 50 plants in the protected rows only two became infected as compared with 42 of the unprotected plants.
In 1974 and 1975 the individual components of this system were tested to assess their respective effect on preventing spread.
In these trials, infector plants of about the same size as the 3–4 month-old bait plants were used.
A plot consisted of five rows of which the middle row contained bait plants and the other rows contained infectors, each row containing 10 plants.
Treatments were tested
Authors
W.P. Mowat, J.A.T. Woodford
Keywords
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