5 Most Venomous Spiders in the World

 Venomous Spiders and Human Interactions

There are over 43,000 species of spiders worldwide. Not all spiders are venomous and the ones that are rarely have adverse effects when interacting with humans due to the size difference.

However there are some spiders that have really potent venom that can lead to serious medical complications if you get bitten by one.

Here is a list of 20 of the most venomous spiders on the planet.

1. Australian Funnel web spider

The Australian Funnel-web spider can be found in Australia on the barks of trees and under logs.

The Australian Funnel-web spider is highly venomous and has the title of the fastest-killing spider. Its venom claims its victim's life in 15 minutes or less.

Due to its potent venom, it's important to immediately seek medical attention if you get bitten by one.

If you get bitten by the funnel web spider you will start to see swelling and redness around the bite wound and you may experience abdominal pain.

2. Brazilian Wandering Spider

While other spiders on this list try to avoid confrontation, the Brazilian Wandering Spider is the total opposite.

It is known for its aggressiveness and defensive stance and won't shy away from attacking if disturbed.

If you still aren't convinced to steer clear from this spider, the Guinness Book of World Records named it the deadliest spider in the world, and rightfully so.

The venom causes a lot of pain and can kill victims in less than an hour.

This won't be the only thing that you'll be worried about if you are a human male as a painful erection is also a symptom of this spider's bite.

3. Red Widow

The red widow spider is native to parts of central and south Florida. Its scientific name is Latrodectus bishopi.

You can identify a red widow spider from its bright red legs and orange oval marking on the abdomen.

The female's venom is what you should be worried about with this spider. It contains a neurotoxin that causes muscle spasms in its victims.

The venom from this spider is highly toxic and is considered 25% more potent than that of a rattlesnake.

The males are smaller than the females and have more elongated bodies.

4. Katipo

The katipo is a small venomous spider native to New Zealand.

The name 'Katipo' is Maori and translates to "night stinger".

Its bite can cause a lot of pain and even induce comas and seizures.

5. Sydney Funnel web spider

This spider species is native to Sydney, Australia as the name suggests.

It is a member of the Australian funnel-web family of spiders.

Its bite is medically significant and can lead to other medical complications and even death if left untreated.

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PEST

        

Pest are organism capable of causing damage to crops, food, livestock, etc.

Types of pest

1.    Insects.

2.    Birds.

3.    Rodent.

4.    Monkeys.

5.    Nematodes.

6.    Man.

Effect of economic importance of insect pest in crop production.

1.    Insect pest destroy crop in the field through their biting, chewing, boring, sucking and defoliation activities.

2.    They cause reduction in the viability of stored produces

3.    They increase the cost of production during the course of controlling them.

4.    They render vegetables fruit unattractive and unmarkable.

5.    They generally reduce the yield of crops.

6.    They reduce the quality of production either in the store or in the field.

7.    Some are carriers or vector of diseases.

8.     The profits of farmers are reduced.

Prevention and control of pest

          Pest of crops can be prevented or controlled through the following method.

1.     Physical control

2.     Cultural control

3.     Biological control

4.     Chemical control

·        Physical control: It involves the physical removal of a pest by:

1.     Hand picking of insect.

2.     Setting trap to catch rodent.

3.     Shooting rodent with gun.

4.     Tending around the rain with wire nets.

·        Cultural control: This method involves the use of farm activities to prevent or control pests especially on the field. Example of cultural control includes:

1.     Crop rotation.

2.     Bush fallowing.

3.     Change in the time or planting.

4.     Regular weeding.

5.     Proper timing or planting.

6.     Bush burning.

7.     Proper time or harvesting.

·        Biological control: It involves the introduction or the natural enemies. Such enemies eat up or feed on the pest.

·        Chemical control: It involves the use of chemicals called pesticides to control pest on crop plant. These chemical which are in form of powder, liquid, granules and tablet are used on the insect by various method like spraying or dusting seeds on plant to check pests. Examples of such chemical include:

1.     Insecticides

2.     Rodenticides

3.     Phosphate.

4.     Nematocides

5.     Pesticides. Etc.