Page 17 - 2017 Griffin Gazette Issue 4
P. 17

pharmaceutical tobacco. Release rates           for use in propagation and young plant           Sachets provide great protection in
start at 5-10 per 100 square feet.              stages. Use mini sachets on hooks or sticks      medicinal marijuana
                                                at a rate of 20 per 100 square feet.
Fungus gnats – Fungus gnats are                                                                  Amblyseius cucumeris – predatory mites that
problematic in both greenhouses and             Whiteflies – Whiteflies are most problematic     feed on thrips
warehouses, impacting all crops. Prevention     in solanaceous crops, including tomatoes,
depends on the media used in production.        and cucumbers. Unlike other pests, BCA           The tiny parasitoid Aphidius wasps keep
For universal prevention regardless of          control of whiteflies generally starts at first  aphids at bay
media used, turn to the predatory beetle        sign of the pest instead of on a preventative
Dalotia coriaria (formerly known as Atheta      basis. Control relies on parasitoid wasps,       Dalotia, aka Atheta – nocturnal, predatory
coriaria) and the predatory mite Hypoaspis      including Eretmocerus eremicus and               beetles feed on fungus gnat larvae
miles. Both are released once, early in the     Encarsia formosa, and requires an active
crop, and will establish in the production      scouting program to assess pest and BCA
space. Dalotia can be also be sustained in      populations at different leaf clusters on the
breeding boxes, long lasting colonies that      crop. Contact GGSPro to learn more about
are easily supported (request GGSPro’s          whitefly control with BCAs.
bulletin to learn more). Release Dalotia at
a rate of 25-50 per 100 square feet and         Effective, preventative control of insect and
Hypoaspis at a rate of 1000-3000 per 100        mite pests can be achieved with BCAs in all
square feet.                                    CEA crops. Success simply requires a solid
                                                plan and a commitment to early release to
Spider mites – Spider mites are the             build the protective shield. Griffin can help
scourge of a number of CEA crops,               you make this happen, with personalized
including strawberries, medicinal marijuana,    BCA plans and continued support from
cucumbers, peppers and tomatoes.                our GGSPro team. Talk to your Griffin sales
Prevention is worth its weight in gold and      representative to get started!
can be achieved with several species of
predatory mites, including Amblyseius           See the Bonus content in the digital version
andersoni, Neoseiulus californicus (formerly    of the Gazette for additional details on
A. californicus) and N. fallacis. Choose        product use for the BCAs mentioned above.
andersoni or fallacis for cooler conditions
and californicus for warmer conditions. For        What is
tomato and medicinal marijuana, the best          controlled
choice is andersoni, as it also provides         environment
protection against russet mites, which           agriculture?
are extremely difficult to control once
established in a crop. The most efficient          Controlled environment
means of providing preventative control is             agriculture (CEA)
to use controlled release sachets, which are             encompasses
hung in the crop and replaced every four to
six weeks (every four weeks in warehouse            production of edibles
applications or on medicinal marijuana).             and medicinal crops
Andersoni and californicus are available in      under cover, in structures
sachet form. Place sachets at 10 per 100            such as high tunnels,
square feet for most crops and a little more
densely (15 per 100 square feet) for stronger         greenhouses and
protection in medicinal crops. Fallacis is               warehouses.
available only in bulk form, requiring weekly
releases to maintain the protective shield.
Release fallacis at a rate of 100-150 per 100
square feet.

Thrips – Thrips can attack all CEA crops,
though they are less common on lettuces
and leafy greens. Preventative control is
best achieved with predatory mites, either
Amblyseius cucumeris or A. swirskii.
Swirskii are more aggressive feeders, but
require higher temperatures, so their use
is generally limited to summer months in
greenhouses. There is one more limitation
to consider for swirskii: The oils in tomato
tissue make swirskii less effective. Utilize
sachets for efficient release for preventative
programs. Stick sachets are especially nice

Digital Bonus Content | griffins.com/publications                                                1 7Griffin Gazette 2017 |
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