SLIDE 1
Short-term fumigation of h honey bee colonies with b l i ith - - PowerPoint PPT Presentation
Short-term fumigation of h honey bee colonies with b l i ith - - PowerPoint PPT Presentation
Short-term fumigation of h honey bee colonies with b l i ith formic acid for the formic acid for the control of varroa mites Robyn Underwood Robyn Underwood Penn State University Formic Acid Formic Acid Controls varroa mites and
SLIDE 2
SLIDE 3
Honey flow Honey flow
SLIDE 4
Varroa mites Varroa mites
David Ostermann
Immatures Adult female
Robyn Underwood
SLIDE 5
Treatment Treatment
Late September No treatment Low dose gel pack Low dose gel pack
(with or without oxalic acid in January)
Hi h d
l k
High dose gel pack
(with or without oxalic acid in January)
SLIDE 6
Formic acid gel pack Formic acid gel pack
SLIDE 7
Mite Drop (Sep vs Oct )
Before
Mite Drop (Sep. vs. Oct.)
70 80
y After
50 60
ling per day
30 40
r of mites fal
10 20
Number
Control Low High
Treatment
SLIDE 8
Mean Abundance (Sep vs Oct ) Mean Abundance (Sep. vs. Oct.)
S t
18 20
Sept Oct
12 14 16
0 Bees
6 8 10
Mites per 100
2 4 6
- No. M
Control Low High
Treatment
SLIDE 9
Oxalic Acid - January Oxalic Acid - January
SLIDE 10
Mite Drop (OA treatment) Mite Drop (OA treatment)
Control
160 180 200
y LowNO LowOx HighNO HighOx
120 140 160
alling per day
60 80 100
er of mites fa
20 40
Numbe Sampling period Before Ox. 2-day Ox. Next 5 days Next 7 days
SLIDE 11
Spring Spring
SLIDE 12
Mean Abundance Mean Abundance
22 24 26
Fall Spring
16 18 20
0 Bees
*
8 10 12 14
*
Mites per 100
*
2 4 6
- No. M
Control SmallNO SmallOx LargeNO LargeOx
Treatment
SLIDE 13
Brood Area Brood Area
Control
3.0 3.5
LowNoOxalic LowOxalic HighNoOxalic HighOxalic
2.0 2.5
f brood
1 0 1.5
- . frames of
0.5 1.0
N
0.0
Fall After FA trt Spring Time
SLIDE 14
Colony Survival Colony Survival
1 0 0.8 0.9 1.0
Dead Alive
0 5 0.6 0.7
n Alive
0.3 0.4 0.5
Proportio
0 0 0.1 0.2 Control LowNO LowOx HighNO HighOx 0.0
Treatment
SLIDE 15
Conclusions Conclusions
FA treatment did not affect mean
abundance
Oxalic acid decreased mean abundance Oxalic acid decreased mean abundance Brood area not affected C l
i l ll
Colony survival poor overall
SLIDE 16
Acknow ledgments Acknow ledgments
Jim Steinhauer, Tiffany Crum, Marcus Dennis,
Glenn Crimbring, Mary Snow, Craig Cella, Henry Street Paul Krepicz Mike Thomas Rene Street, Paul Krepicz, Mike Thomas, Rene Troutman, Dennis Keeney, Sharon McDonald, Linda Wertz, Karen Roccasecca, Amber Lamons, Mik A d Mike Andree
Nancy Ostiguy, James Stimmel N ti
l H B d