how do pests desrtoy crops?
156767
they eat part or the whole the crop
765175
Aphids live on certain plants in warm climates. The aphids that live better little aphid lives are the ones in a symbiotic relationship with certain ants that also live near the plants. The aphids feed on the plant juices, and the ants "milk" the aphids for food like we milk cows. The ants  keep away some other critters that would eat the aphids. Cool deal all around for the little buggers until someone comes around with the bug spray.
168011
its famaly of viruses,mostly affects plants-potato,barley pea
614116
In some areas, cockroaches are able to live outdoors, and make their way into human habitation from there.  Of the 4000 or so species of cockroach worldwide, only about a dozen are household pests.  Most of them live quiet lives on the forest floor and never bother anyone.\n\nThose few species that do become pests, though, are pretty major pests.  In areas where they cannot live outside, they get into homes by being carried in with contaminated foodstuffs, or even egg cases (ootheca) carried in on clothing or in the cracks of shoes.  Sometimes adults will hitch a ride from one building to another.\n\nAt one time the BioSciences building at the University of Alberta was infested with cockroaches.  After one lab, I picked up my backpack and a bunch of cockroaches ran out of the back pocket (where I had foolishly left an open bag of chips).  I left my backpack outside that night.
702645
From exactly what you said in bold letters....they break down organic matter.  Otherwise the Earth would be littered with dead animals, leaves, trees, birds etc.  Fungus, bacteria, and insects are all decomposers and a very important part of the Life Cycle.\n\nThe organic matter is then released into the soil and taken up in the raw nutrient/mineral content by plants>animals eat plants>animal dies>cycle repeats.
97680
Commodity Crops (corn, rice, etc.)\n\nGrain \n\nOil Seed Crops \n\nCitrus Fruits \n\nOrchard Fruit \n\nBerries  \n\nGarden Vegetables \n\nMelons, Squash and Cucumbers \n\nFlavorings, Herbs and Spices  \n\nNuts
530857
Germany follows European Union regulations, regarding what can and cannot be applied on crops (e.g. pesticides, herbicides, etc.)  \n\nYour questions is too vague to give a really good answer... They plant things, let them grow, and harvest them.  They raise animals and slaughter them.\n\nIf you post a more specific question, you'll likely get a more specific answer.
775801
Plants survive by adapting to the environment.  If the local fauna is eating the plant, the plant will develop a toxicity to ward off such animals form dining on the plant or the plant will reproduce in such numbers that a bite here and there doesn't matter.\n\nThe trick comes in when the animal develops a bond with a particular plant and adapts to the toxicity and uses this plant toxin to form its own shield against its predators--such as Monarch Butterflies and Milk weed or Gulf fliterary butterflies and the corky stemed passion flower.
1016364
An infestation is where, in this case, a certain insect takes over something, plants, trees, fields, areas, etc... and becomes uncontrollable.  This in turn affects neighboring plants, trees, etc... and the infestation continues to grow beyond the means of reasonable control. Infestation can be from leaf to leaf, plant to plant, all the way up to region to region.\n\nAn incidence is where one or a few insects are found, or the damage from these insects, but does not spread, or is limited to a one time occurance that, with proper management, may be kept in check or the insects are completely killed with no other incidence recorded.  Usually it is isolated or one time incident.
1007298
They help control the populations of small arthrapods, either by eating them outright or laying eggs on some things that eat them alive after they hatch. (mosquitos, flies, moths, caterpillars, spiders, smaller wasp species, etc.)\n\nThey in turn become food for birds, spiders and larger predatory insects.
561062
its biological defense.  probably made from the types of plants it eats.  many caterpillars do this, grasshoppers do to.
461337
Really-think about a roach-they are tolerant to drought, water, heat, and radiation. They are annoying and will live after a nuclear disaster. The louse-is a more fragile creature and there are different types. The worst pests survive forever no matter how many or their relatives are killed.
1085182
Moles have a living area in their tunnels, including a storage area for extra food(worms with their heads bitten off), and a latrine area.\nMoles are VERY terratorial, and a single yard will usually only have one, but 2 tunnel systems may overlap on a property, sometimes.  If a mole is killed, and the population in the area is high, another mole will move into the tunnels.\nMoles tunnel around looking for food, such as grubs, or periodical cicada.  To get rid of the moles, treat for grubs.  It it's a 17 year locust emergence, get used to the moles...at least for a few years.\nThey produce 3-5 young in the spring.\nHere is a link to information
185688
Look under leaves, wood, bricks, etc. Many insects like to burrow in tight, protective places. Failing that, check bushes and trees.
236237
The two main group of pests that feed on food waste are rodents and insects such as flies and cockroaches. They are dangerous because they can spread disease. The most famous example is the role of the rat in spreading the black death which wiped out up to a third of Europe's population in the 14th century and was a recurring threat to populations until the 1700's. It is widely believed to have been caused by the bacterium Yersinia pestis spread by fleas with the help of animals like the black rat (Rattus rattus).
1159432
Certain gases and their odours that are emitted by manures, decaying tissue etc are the ones that attract flies. Basically they use these to lay their eggs.
199879
grubs and insect later hunt animal