If you worry about Captan phytotoxicity, then you should also worry about LLS being phytotoxic under the same conditions. Liquid lime sulfur is a ’normal’ (ie not emergency) choice for post infection (kickback). However, I wouldn’t trust it 96 hours after beginning of rain, unless the temperature was very low.
Typically, we use DH (degree-hours) to describe the post infection efficacy. In Celsius, we consider LLS good for 250 DH, meaning 25 hours at 10°C. This is calculated once the infection is started. If you calculate from the beginning of the rain, then about 400DH (40 hours at 10, or 80 hours at 5°C) hope this helps. Vincent > Le 7 avr. 2016 à 12:56, David Kollas <kol...@frontier.com> a écrit : > > > Does anyone have enough experience with liquid lime sulfur to comment > on it as an emergency > choice for application before rains have stopped during the current long > infection period? It is listed as > having 72-96 hours back-action in the New England Tree Fruits Management > Guide. > In my particular situation, Half-Inch Green stage tissues were exposed > many hours during two of > the previous three nights to 18-20 degrees F, and are probably extra > sensitive to captan penetration > and phytotoxicity. > > David Kollas > Kollas Orchard > Connecticut > > _______________________________________________ > apple-crop mailing list > apple-crop@virtualorchard.net > http://virtualorchard.net/mailman/listinfo/apple-crop Vincent Philion, agr., M.Sc. Microbiologiste/Phytopathologiste (pomiculture) Institut de recherche et de développement en agro-environnement Research and Development Institute for the Agri-Environment www.irda.qc.ca Centre de recherche 335, Rang des Vingt-Cinq Est Saint-Bruno-de-Montarville (Québec) J3V 0G7 vincent.phil...@irda.qc.ca Bureau: 450 653-7368 poste 350 Cellulaire: 514-623-8275 Skype: VENTURIA Télécopie: 450 653-1927 Verger expérimental 330, Rang des vingt-cinq Est Saint-Bruno-de-Montarville (Québec) J3V 4P6 Téléphone et télécopieur : 450 653-8375 Local pesticide: 450-653-7608 _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.net http://virtualorchard.net/mailman/listinfo/apple-crop
