Survival of Botrytis cinerea as mycelium in rose crop debris and as sclerotia in soil

Abstract

Botrytis blight caused by Botrytis cinerea is an important disease of rose (Rosa hybrida) grown in greenhouses in Brazil. As little is known regarding the disease epidemiology under greenhouse conditions, pathogen survival in crop debris and as sclerotia was evaluated. Polyethylene bags with petals, leaves, or stem sections artificially infected with B. cinerea were mixed with crop debris in rose beds, in a commercial plastic greenhouse. High percentage of plant parts with sporulation was detected until 60 days, then sporulation decreased on petals after 120 days, and sharply decreased on stems or leaves after 90 days. Sporulation on petals continued for 360 days, but was not observed on stems after 150 days or leaves after 240 days. Although the fungus survived longer on petals, stems and leaves are also important inoculum sources because high amounts of both are deposited on beds during cultivation. Survival of sclerotia produced on PDA was also quantified. Sclerotia germination was greater than 75% in the initial 210 days and 50% until 360 days. Sclerotia weight gradually declined but they remained viable for 360 days. Sclerotia were produced on the buried petals, mainly after 90 days of burial, but not on leaves or stems. Germination of these sclerotia gradually decreased after 120 days, but lasted until 360 days. Higher weight loss and lower viability were observed on sclerotia produced on petals than on sclerotia produced in vitro

Mycoflore de quelques variétés du fraisier (<i>Fragaria ananassa</i> L.), cultivées dans la région du Gharb et le Loukkos (Maroc)

“…Les lésions observées sur les parties aériennes du fraisier ont été dominées surtout par B. cinerea suivie par A. alternata. En effet, B. cinerea a été signalée sur diverses cultures d'importance agronomique comme la vigne (Mackenzie et al, 2003, Gabriolotto et al, 2009 ), le fraisier (Schmid et al, 2005), la tomate (O'neill et al, 1997(O'neill et al, , Mouria, 2009, la laitue (Beneden et al, 2009) et des plantes ornementales comme Rosa hybrida (Araújo et al, 2005). Ce champignon entraine le brunissement des fleurs et la pourriture des fruits, mais aussi le brunissement et la pourriture des feuilles, les chancres et la pourriture des bulbes, des tubercules et des racines et même la fonte de semis (Hausbeck et Moorman, 1996).…”

Brazilian isolates of Clonostachys rosea: colonization under different temperature and moisture conditions and temporal dynamics on strawberry leaves

“…Temporal dynamics need to be re‐evaluated in whole plants and crop debris to determine the ability of Cr to establish and survive. Botrytis cinerea can survive and sporulate in crop debris for up to 1 year (Araújo et al. 2005); thus, the longer the antagonist survives in such debris, the fewer sprays are required to control grey mould.…”

Influence of climatic factors on dry flower, grey and green mould diseases of macadamia flowers in Australia

“…Temperature extremes affect pathogen growth and sporulation, with high temperatures being most harmful to both processes (Araújo et al, 2005). In general, critical climatic factors affecting the development of foliar and fruit diseases are temperature and RH (Raid et al, 2008; Rogers & Stevenson, 2006).…”