A comparative evaluation of post-infection efficacy of mefenoxam and potassium phosphite with protectant efficacy of azoxystrobin and potassium phosphite for controlling leather rot of strawberry caused by Phytophthora cactorum
Rebollar-Alviter. A Wilson. L. L Madden. L. V Ellis. M. A
Crop Protection ; 2010 [Vol.29] Pages:349-353
Abstract
Leather rot, caused by Phytophthora cactorum , is one of the most important fruit-rotting diseases of
strawberry worldwide. Efficacy of mefenoxam and potassium phosphite against leather rot, when
applied in a post-infection fungicide program, made in response to rain events was evaluated over 3
years of testing. Post-infection treatments of potassium phosphite and mefenoxam were compared with
calendar-based treatments of azoxystrobin or potassium phosphite sprayed weekly, starting at late
bloom (fruit set). In order to obtain high-risk conditions for infection (splash dispersal of the pathogen
and subsequent infection periods), plots were flooded until standing water was observed between the
rows. Post-infection applications were made within 36 h after the initiation of a flooding event. Leather
rot incidence in the untreated controls ranged from 15 to 66% over the 3 years. All fungicide treatments
had significantly (P < 0.001) less leather rot incidence than in the untreated control. There were no
significant differences in leather rot incidence between the different fungicide treatments. Percent
control (the percentage reduction in incidence relative to the check) was as high as 100% with all
fungicide treatments. Mefenoxam and potassium phosphite post-infection (after flooding) provided
control equal to that obtained with a calendar-based spray program, but with from 1 to 3 fewer fungicide
applications.