Just a courious question. I usually spray each at different
times but I need to do all three this weekend. I have done
the rotenone today but it just got me to wondering if I
could save a few steps if I mixed all together in the spayer
and did it at the same time. My main concern is will the
rotenone kill the BT?
I use the BT on my tomatos and cabbage for the tomato
hornworm I did not know that rotenone would kill them.
I have a slight problem with red spider mites on a few
tomatos so I was wanting to spray them and the cabbage for
worms that are starting to eat them. I figured to give them
a double wammy before things get out of hand.
Due solely to its source of origin, rotenone is considered an organic
control. So is curare.
Rotenone is, nonetheless, a potent broad-spectrum insecticide ... you are
killing your beneficials off, too. Rotenone is not the answer, it's the
Take a look at this web page. There are other highly effective and longer
lasting means of controlling the red spider mite including biological
controls and cultivational practices. As always, google is your friend. I
searched using the term "red spider mite predator" and grabbed this link
off the first page.
I quote a portion of the page:
Various insects and predatory mites feed on spider mites and provide a high
level of natural control. One group of small, dark-colored lady beetles
known as the "spider mite destroyers" (Stethorus species) are specialized
predators of spider mites. Minute pirate bugs, big-eyed bugs (Geocoris
species) and predatory thrips can be important natural enemies.
A great many mites in the family Phytoseiidae are predators of spider mites.
In addition to those that occur naturally, some of these are produced in
commercial insectaries for release as biological controls. Among those most
commonly sold via mail order are Galendromus occidentalis, Phytoseiulus
persimilis, Mesoseiulus longipes and Neoseiulus californicus. Although
these have been successful in control of spider mites on interior plants,
effective use outdoors has not been demonstrated in Colorado. Predatory
mites often have fairly high requirements for humidity, which can be
limiting. Most suppliers provide information regarding use of the predator
mites that they carry.
One reason that spider mites become problems in yards and gardens is the use
of insecticides that destroy their natural enemies. For example, carbaryl
(Sevin) devastates most spider mite natural enemies and can greatly
contribute to spider mite outbreaks. Malathion can aggravate some spider
mite problems, despite being advertised frequently as effective for mite
control. Soil applications of the systemic insecticide imidacloprid (Merit,
Marathon) have also contributed to some spider mite outbreaks."
Although that last paragraph did not specifically name rotenone, it doesn't
take a rocket scientist to figure out that it has about the same killing
power as the others.
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