Facts! - The two-tubes aspirator design was first presented in a 1929 paper by Frederick William Poos, Jr., who is also the namesake of the term "pooter". 

(2) How The Tullgren Tunnel Works?

The Tullgren Funnel Works By Creating A Desiccation Gradient Over The Sample Such That Mobile Organisms Will Move Away From The Dry Environment And Fall Into A Collecting Vessel, Where They Perish And Are Preserved For Examination!

(3) How Can You Make The Tullgren Tunnel?

You Can Make A Simple Tullgren Funnel From A Plastic Soft Drink Bottle. Cut The Bottom Off And Turn The Bottle Upside Down. Place A Circle Of Fine Wire Mesh In The Bottle And Cover The Mesh With Leaf Litter. Suspend The Neck Of The Bottle Over A Container Of Water Mixed With A Little Detergent.

For plants that are smaller and low to the ground, place the sheet on the ground next to the plant. For plants that are higher, hold the beat sheet in one hand while hitting the plant several times with a stick or net handle held in the other hand. The insects on the plant will fall onto the sheet and must be collected quickly before they escape. For flying insects it is recommended that an aspirator be used to suck up the bugs.

Beating the plant parts, aphids, spider mites, scale insects crawlers and thrips will be dislodged and land on the paper where they can easily be seen and collected with an alcohol-soaked cotton swab and put in a vial of alcohol.

 

A pitfall trap is a device used to trap insects that are active on the ground surface. Pitfall traps usually consist of a beaker that is buried so that the lip of the beaker is level with the ground surface. ... Pitfall traps are often used as a passive sampling technique to assess biodiversity in an area.

Problem

There are inevitably biases in pitfall sampling when it comes to comparison of different groups of animals and different habitats in which the trapping occurs. An animal's trappability depends on the structure of its habitat (e.g. density of vegetation, type of substrate). 

·         Collectors and researchers of various ground-dwelling arthropod species may use pitfall traps to collect the animals they are interested in. This can be done without bait (for example ground beetles and spiders) or with bait (for example dung beetles).^{[citation needed]}

 

Pitfall traps come in a variety of sizes and designs. They come in 2 main forms: dry and wet pitfall traps. 

 

A pitfall trap is a simple device used to catch small animals - particularly insects and other invertebrates - that spend most of their time on the ground. In its most basic form, it consists of a container buried so that its top is level with the surface of the ground. Any creatures that wander nearby may fall in.