Effect of Timing of Preharvest Fungicide Applications on Postharvest Botrytis Fruit Rot of Annual Strawberries in Florida (original) (raw)
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Plant Disease, 2005
Legard, D. E., MacKenzie, S. J., Mertely, J. C., Chandler, C. K., and Peres, N. A. 2005. Development of a reduced use fungicide program for control of Botrytis fruit rot on annual winter strawberry. Plant Dis. 89:1353-1358.
Crop Protection, 2017
Florida strawberry production is highly affected by plant diseases. Botrytis fruit rot (BFR) is an important disease that can cause more than 50% yield losses if not well-managed. The disease is traditionally managed in Florida by preventative fungicide applications using a multi-site fungicide in early season when environmental conditions are less conducive for disease development and single-site fungicides during bloom when the environment is more conducive. More recently, many Florida growers have been following the Strawberry Advisory System (StAS), a web-based disease forecast system, to improve timing and reduce the number of fungicide applications. In this study, we evaluated the effectiveness of different fungicides used after StAS spray alerts compared to Calendar-based applications with the objective of implementing specific fungicide recommendations for Botrytis control into StAS. Two field trials were conducted, one in 2013e2014, and the second in 2014e2015 season. During periods that predicted high risk of disease incidence, BFR was best managed by StAS-triggered applications of fludioxonil þ cyprodinil, or fluopyram. Yields were increased by StAS-triggered treatments that included fludioxonil þ cyprodinil, thiram and the SDHI fungicides fluopyram, penthiopyrad, and fluxapyroxad, and the Calendar-based treatment in one season. However, the StAS-triggered treatments had about half the number of applications of the Calendar-based program. Our results show that timing and the choice of the fungicide to be sprayed when weather conditions are highly favorable for disease development are key to effective management of BFR.
Plant Health Progress, 2018
The Florida Strawberry Advisory System (StAS) forecasts the need for fungicide applications for control of Botrytis fruit rot (BFR) and anthracnose fruit rot (AFR) based on leaf wetness and temperature during the moist period. StAS was evaluated in Ohio for four seasons from 2011 to 2014 and compared with the calendar-based system currently used by growers. BFR was severe in 2011 and 2013 and nearly absent in the other years, whereas AFR was not a problem in any of the four years. Using the calendar-based system, five to six applications were made each year for BFR, whereas only two or fewer were recommended using StAS. For AFR control, six to seven applications were made based on the calendar system, whereas three or fewer were recommended by StAS. There was no case in which the calendar program outperformed the StAS in disease management. Use of StAS would greatly reduce the number of sprays needed for control of fruit rot diseases and result in significant savings for Ohio strawb...
Crop Protection, 2010
A protectant fungicide (Captan, a.i. captan) and a systemic fungicide (Switch, a.i. fludioxonil þ cyprodinil) were evaluated as pre-and post-inoculation applications for control of anthracnose fruit rot (AFR), caused by Colletotrichum acutatum, under a short (6 or 8 h) or long (18 or 24 h) wetting period. Evaluations were conducted for two seasons in Maryland and for two seasons in Florida. Both Captan and Switch were very effective for control of AFR when applied prior to inoculation, but control was more effective under the shorter wetting period. Switch was as effective when applied 4, 8, or 24 h postinoculation as when applied before inoculation, but control was better under the short wetting period. Captan was effective when applied 4 or 8 h after inoculation under the short wetting period, but was ineffective at 24 h post-inoculation. Post-inoculation sprays of Captan were ineffective at any time under the long wetting period. The post-infection activity of Switch allows greater flexibility for managing AFR when fungicide applications are scheduled based on weather-based decision-support systems.
EDIS
Florida’s producers use fungicides to manage anthracnose and botrytis fruit rot diseases, which find favorable growth conditions in Florida’s climate and can reduce strawberry yields and profits. The Strawberry Advisory System (SAS) uses information about weather conditions and user-entered information about past fungicide applications to evaluate the potential spread of these diseases in strawberry fields. If the risk of disease spread is low, no fungicide application is recommended, allowing producers to save on fungicide application costs. In this study, we summarize the results of a 2012/2013 survey of strawberry producers, and focus on the questions, How significant is the impact of anthracnose and botrytis on Florida strawberry producers’ yields? What are the typical fungicide application frequencies used by the producers? What percent of strawberry producers use SAS? and Are there any effects of SAS subscription on producers’ fungicide application? This 4-page fact sheet was ...
BioTech
Grey mould, caused by Botrytis cinerea and other Botrytis spp., is a major cause of fruit rot in strawberries and other fruit crops worldwide. Repeated fungicide applications are essential in order to secure harvests. However, resistance to all currently registered single-site fungicides is widespread. The rising importance of strains with multiple resistance to most or all fungicides is of particular concern. These strains may be introduced into fields via contaminated nursery plants and/or by immigration from adjacent plots. On the basis of research conducted in northern German and Danish strawberry production, a concept to manage fungicide resistance under northern European conditions has been developed and put into regional strawberry production practice. This principally includes the testing of nursery plants for fungicide-resistant Botrytis strains prior to planting; the restricted and specific use of fungicides at flowering in the production fields, taking account of the resi...
The objective of this study was to examine the economic benefits associated with precision fungicide application system for Florida strawberry production. Given the weather and disease forecast system developed by the University of Florida researchers (Peres, 2010a , strawberry growers can potentially 1) reduce fungicide application rates during cool and dry conditions without affecting yields, thus reducing production costs; or 2) apply fungicide at the precise time of high disease pressure during warm and wet weather, therefore, decreasing disease development and spread, and increasing the yields and profits.