Do you have any idea about how do aphids damage plants? You probably know how upset gardeners are to see aphids on their prize roses. They have good cause for anxiety since aphids do a lot of damage to many plants. They also do aphids do a lot of damage to many plants.
How do aphids damage plants
They also do considerable economic harm to farmers. Their activates affect crops in two ways. By sucking the sap aphids soon cause the plant to another; they can be responsible for spreading virus infections among crops.
The mouthparts of the aphid are modified to form a needle-sharp tube which is inserted into the sap-carrying cells of the plant. The sap is thus diverted to the aphid and because it has a low nutrient value the aphid drinks vast quantities.
Most of the sugary sap passes straight through the aphid and is excreted as honeydew. It is this that is so favored by ants and by stroking the aphids with their antennae they stimulate a faster flow of honeydew.
Why does the scarab beetle roll dung?
A fairly common sight in the drier areas of southern Asia, the United States and Africa, is a medium-sized black beetle scurrying backwards rolling a ball of dung.
This is often several times the size of the beetle and can be as big as a tennis ball. Often a beetle will be helped in its labors by another, but if it is not careful the newcomer will make off with the dung himself.
Once a suitable spot is found the beetle digs a chamber and feeds on the dung underground. Later in the year the beetles pair up and as before bury some dung. This time, however, the dung is intended for their young.
The female shreds it carefully and refashions it into a pear shape in which the egg is laid. On hatching, the larva has a readily available source of food which it quickly eats before changing into an adult.
The scarab beetle parents go to a lot of trouble to provide a handy food supply for their young. The larvae have no worries about setting out on dangerous feeding expeditions and they are very secure and well protected in their own underground larders.
A lot of effort is involved in providing for the young in this way but the method is very successful. The female does not usually lay more than four eggs in a year.
How does the ant lion larva catch ants?
In contrast to the graceful beauty of the adult insect, the Larva of the lion bears a pair of cruel-looking jaws, and catches ants and small spiders in a most ingenious way. (It is the behavior of the larva that gives the insect its name.) The small, fat creature carefully digs a steep-sided, conical pit in dry, sandy soil in a sheltered spot.
The pit is about 3 inches in diameter and 2 inches deep and so forms quite a treacherous obstacle for any passing ant or other small insect. Alerted by dislodged grains of sand, the ant lion larva immediately appears from hiding at the bottom of the pit.
It frantically scoops up sand on to its head and in a jerking movement flings it at its prey. The ant is usually bowled over by this onslaught and, losing its footing, tumbles down the sides of the pit to be pounced on and devoured by the ant lion.
There are over 600 species of ant lions, several species occurring in the United States and some in southern Asia, but not all dig pits to trap their prey.
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