Medhat,
Is the concentration still 65% or did that change?
Hello Bill,
It is 65% formic acid. There was some damage to eggs in the first day. However, the treatment was intermittent; once every 10 days. The treated colonies were able to recover. We did not find any difference in brood production and bees. No damage to queens. The key leaving the entrance open.
New Miticides for Integrated Pest Management of Varroa destructor (Acari: Varroidae) in Honey Bee Colonies on the Canadian Prairies
L. P. VANDERVALK,1,2 M. E. NASR,3 AND L. M. DOSDALL. J. Econ. Entomol. 107(6): 2030Ð2036 (2014);
Impact of Treatment on Varroa Mite Drop. Varroa mite drop was 21 per day before treatment in September 2011, increased substantially to 200- 300 per
day after the first application in all treated groups, and then fell to below 100 mites per day after the first week in the HopGuard and control groups, while peaking with reapplications in the formic acid group and fluctuating in colonies subjected to Thymovar and Apivar. By 6 wk posttreatment, mite drop in the control colonies averaged about 100 per day. In early May of 2012, mean varroa mite drop levels were ~33 per day before treatment for all colonies, but following treatment application varroa mite drop increased rapidly to150-200 per day for all colonies except the controls. Spikes in mite drop for 3 d were
evident at each reapplication of HopGuard. From mid- May to mid-June, mean mite drop numbers gradually declined in all colonies except the controls (Fig. 6).
Varroa mite drop did not vary significantly among treatment means before treatment during the fall 2011 trial (F=0.90, df=4, 33, P=0.4743) or the spring 2012
trial (F = 0.66, df = 4, 35, P = 0.6236). Repeated measures analysis showed that treatment affected Varroa mite drop over time during the fall 2011 trial (F =
4.18, df=4, 28, P=0.0089; Fig. 5) and the spring 2011 trial (F= 8.05, df = 4, 30, P= 0.0002; Fig. 6). Efficacy of Treatments. Treatment efficacies were as follows for the fall 2011 trial: Apivar (87.07±2.69%), formic acid (78.48 ± 8.47%), Thymovar (88.91 ± 8.47%), HopGuard (42.96 ±6.46%), and the control
(28.69 ± 7.33%). Treatment efÞcacies were as follows for the spring 2012 trial: Apivar (74.93 ± 3.18%), formicacid (71.90
6.52%), Thymovar (82.33
3.32%),
HopGuard (43.56 ±3.18%), and the control (24.09± 3.89%).
There was no impact on brood except Thymovar spring application. Keep in mind the HopGuard used in the experiment was HopGuard I. After this we change the formulation /delivery method to HopGuard II. Paper is available for free if you check the reference in the top.
Regards
Medhat
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