overwintering. Damage symptoms Direct damage, caused by sucking of sap is rarely seen. Sometimes, large populations build up on potatoes or other…
generation of aphids in the spring. In greenhouses, sexual reproduction is very rare and only triggered if lighting signals a shortening day. Solution…
taking the venom gland with it. How to prevent bumblebee stings? Bumblebees rarely sting. The chance of being stung by a bumblebee can be reduced by…
the upper and lower surface of leaves, preferentially in depressions, and rarely on stems or petioles. There are four larval instars. The body tapers…
system is pneumatic and is controlled by a timer or the climate computer. On a rare occasion, when air pressure drops, the system is opened…
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