They have a direct impact on agricultural food production by chewing the leaves of crop plants, sucking out plant juices, boring within the roots, stems or leaves, and spreading plant pathogens. They feed on natural fibers, destroy wooden building materials, ruin stored grain, and accelerate the process of decay.
How do insects affect plants?
Insects may feed on leaves, stems, roots, and flowers of plants. The chewing insects actually consume the infested parts. Types of leaf feeding by chewing insects include pit feeding on leaves by leaf beetles, flea beetles, and young caterpillars.
How do insects affect the growth of plants they feed on?
They are responsible for two major kinds of damage to growing crops. The first is direct injury to plants caused by insects eating leaves and burrowing holes in stems, fruit and/or roots. … They will eat seeds, leaves, roots, whole young plants, fruit and grain – nothing is off the menu when it comes to rodents.
How do insect pests affect crops?
Stem-boring insects can kill or deform individual stems or whole plants. … Insects with sucking mouthparts, such as aphids, scales, leafhoppers, and true bugs, feed by sucking sap from plant tissues. This type of feeding can cause spotting or stippling of foliage, leaf curling, and stunted or misshapen fruits.
Why are insects so important to plants?
Insects create the biological foundation for all terrestrial ecosystems. They cycle nutrients, pollinate plants, disperse seeds, maintain soil structure and fertility, control populations of other organisms, and provide a major food source for other taxa.
What are the disadvantages of insects?
They feed on natural fibers, destroy wooden building materials, ruin stored grain, and accelerate the process of decay. They also have a profound impact on the health of humans and domestic animals by causing annoyance, inflicting bites and stings, and transmitting disease.
How do pests and diseases affect the growth and development of plants?
Nature and Effects of Plant Pests and Diseases
Plant pests and pathogens interfere with the growth and cause damage to cultivated and naturally growing plants. The interference and damage result in the failure of plants to reach their genetic potential.
What are the harmful effects of insects to humans?
Insect bites generally have a couple harmful effects — irritation and illness. The less severe effect is the simple irritation, swelling and pain that sometimes come from bites by certain insects such as mosquitoes, bees and some spiders.
Which insect destroy crops?
Aphids. How it Kills: Also known as plant lice, they are diminutive, soft bodied, pear shaped insects which suck sap, typically during the spring and summer seasons. Severe infestation results in curling of leaves, stunted growth and gradual drying and death of young plants.
What methods can be used to control pests in organic farming?
Mechanical and physical control – include tillage, mowing, cutting, mulching and organic soil coverage and barriers. Tillage turning the soil between crops to incorporate crop residues and soil amendments. It also destroys weeds and disrupts pest life cycle.
How do you control insect pests?
The best way to control both pests and diseases is to keep plants healthy.
- Build healthy soil. Healthy soil provides a home to friendly insects and helps prevent many plant diseases.
- Plant resistant varieties. …
- Space plants correctly. …
- Plant at the right times.