DISEASE CONTROL—MODE OF ACTION Leap contains methyl salicylate (MeSA), a powerful plant compound that elicits a plant’s natural defense systems against pathogen infections. The presence of MeSA can trigger a whole-plant immunity response through a physiological process that helps protect the plant from pathogen spread and further infection. Normally triggered by a localized infection from diseases such as bacterial speck or spot, this defense response is started in the absence of the pathogen by treating the plant with Leap . Due to the unique properties of the MeSA molecule, Leap ’s mode of action provides long-distance signaling to other leaves remote from the infection and even to other plants. This signal response results in production and accumulation of pathogenesis-related (PR) proteins that help the plant defend itself against invasion by pathogens. As such, plants should be treated in low pressure periods—before an infection starts—or early on in an infection. Leap is also a good resistance management tool since it has not demonstrated cross-resistance with any other fungicides/bactericides, making it ideal in rotation or as a tank mix partner with other materials. Use of Leap can reduce disease control costs by decreasing or delaying conventional fungicide/bactericide applications. EFFECTIVENESS OF A ROTATIONAL PROGRAM
40
Leap Manages Bacterial Spot and Prevents Spreading Vertically Leap and ManKocide® (3 lb/A) were applied on alternating weeks for 8 weeks. Actigard®, also rotated with ManKocide, was used at the 0.5 oz/A rate.
33.7
30
20
17.2
9.5
10
7.4
4.3
1.4
1.4
0.5
0.5
0.3
0.1
0
0
May 13
May 20
May 27
Leap 2 qt/A
Leap 1 qt/A
Actigard® 0.5 oz/A
Untreated
Leap Controlled Bacterial Spot and Copper-Based Products, Reducing Copper Applications by Half Leap (or Actigard (0.5 oz/A) in a tank-mix with DiPel® Biological Insecticide) was applied on alternating weeks with ManKocide (2 lb/A) for 8 weeks. ManKocide was also used weekly as a stand- alone treatment.
1000
750
500
250
0
Leap 2 qt/A
Mankocide® 2 lb/A
DiPel® / Actigard
Untreated
69
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