Ask your plant supplier what specific pesticides were applied to your incoming plant material to ensure that no long lasting pesticide residues adversely impact the biological control agents.
While safety, security and environmental impact are the major concerns when storing pesticides, maintaining the quality of pesticides is also important during winter storage.
Here are some tips for winter storage of pesticides:
When Pythium spp. shows up late in the crop cycle, there are few options for salvaging the crop. Once the fungus is managed, it takes time for roots to re-grow, and there may not be enough time for plants to recover prior to sale. Signs of infected plants are wilting and stunting. Roots are soft and decayed, sometimes extending up into the stem where it causes a canker. Looking closely, the rotted outer covering of the root slips from the central core. There are different species of of Pythium that can cause problems on poinsettias.
Photoperiodic lighting is used to create long days for flower induction of long-day (LD) plants or to delay the flowering of short-day plants. Generally, long-day plants will flower when the daylength is longer than 14-16 hours (night length of less than 10 hours). Therefore, long-day lighting should be used from around Sept. 1 to April 15. Note that the critical daylength is likely to be different for each species.
Controlling whiteflies on poinsettias has been challenging since sweetpotato whitefly, Bemisa tabaci, first appeared in Florida in 1986 and then began to appear in greenhouses soon after. It was found to be a new, more insecticide-resistant strain, termed ‘B-biotype,’ with a broader host range than the usual B. tabaci. In 2004 an even more resistant strain, the Q biotype, was found in the US on poinsettia. Initially, these two biotypes were thought to all belong to the same B.