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First record of Oidium anamorph of Podosphaera xanthii on Medusagyne oppositifolia.
Pettitt, T.; Henricot, B.; Matatiken, D.; Cook, R. T. A.; British Society for Plant Pathology, UK, New Disease Reports, 2010, 21, pp article 12, 2 ref. Powdery mildew first appeared on mature 3-year-old bushes of 'jellyfish tree', Medusagyne oppositifolia, grown from seed at Eden Project, Cornwall, England, in collaborative conservation work with the Seychelles Government. Initially, young leaves showed ...
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Numerical abundance of invasive ants and monopolisation of exudate-producing resources - a chicken and egg situation.
Oliver, T. H.; Pettitt, T.; Leather, S. R.; Cook, J. M.; Blackwell Publishing, Oxford, UK, Insect Conservation and Diversity, 2008, 1, 4, pp 208-214, 19 ref. Invasive ants commonly reach abnormally high abundances and have severe impacts on the ecosystems they invade. Current invasion theory recognises that not only negative interactions, such as natural enemy release, but positive interactions, such as facili...
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Development of a system simulating commercial production conditions for assessing the potential spread of Phytophthora cryptogea root rot of hardy nursery stock in recirculating irrigation water.
Pettitt, T. R.; Finlay, A. R.; Scott, M. A.; Davies, E. M.; Annals of Applied Biology, 1998, 132, 1, pp 61-75, 28 ref. A system was developed for monitoring the potential spread of P. cryptogea root rot of the hardy nursery stock (HNS) species Chamaecyparis lawsoniana (cv. Ellwood's Gold), Erica × darlyensis (cv 'J H Brummage') and Calluna vulgaris (cv. Sunrise) in recirc...
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Effect of temperature on the incidence of nodal foot rot symptoms in winter wheat crops in England and Wales caused by Fusarium culmorum and Microdochium nivale.
Pettitt, T. R.; Parry, D. W.; Polley, R. W.; Agricultural and Forest Meteorology, 1996, 79, 4, pp 233-242, 23 ref. The predominant Fusarium or Fusarium-like species infecting winter wheat stem bases and causing foot rot symptoms at growth stage 75 was determined, by isolations in England and Wales during 1992. Of the 4 principal species causing foot rot in the UK (F. ...
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Analysis of Microdochium nivale isolates from wheat in the UK during 1993.
Parry, D. W.; Rezanoor, H. N.; Pettitt, T. R.; Hare, M. C.; Nicholson, P.; Annals of Applied Biology, 1995, 126, 3, pp 449-455, 16 ref. A total of 144 isolates of M. nivale (Monographella nivalis) from stem bases of winter wheat were taken from 30 sites and 91 isolates from grain from 7 sites throughout the UK. Identification by PCR amplification of the internal transcribed spacer (ITS) r...
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Improved estimation of the incidence of Microdochium nivale in winter wheat stems in England and Wales, during 1992, by use of benomyl agar.
Pettitt, T. R.; Parry, D. W.; Polley, R. W.; Mycological Research, 1993, 97, 10, pp 1172-1174, 12 ref. The widespread incidence of benomyl tolerance in M. nivale [Monographella nivalis] populations in the UK was exploited for selective isolations of this species from mixed Fusarium-type infections in winter wheat stem bases. The fungicide, incorporated in ...
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An alternative method of applying copper to control cocoa pod diseases.
Sreenivasan, T. N.; Pettitt, T. R.; Rudgard, S. A.; British Crop Protection Council, Thornton Heath, UK, Brighton Crop Protection Conference, Pests and Diseases - 1990. Vol. 2., 1990, pp 583-588, 6 ref. As an alternative to spraying, water-permeable reservoirs of copper fungicide were attached to cocoa stems so trunk flow and canopy drip would continuously wash copper down to pods concentrated on the lower architecture. This technique was successful and ...
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