කාවා

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කාවා Clothing Moth (Tineola bisselliella) යනු පියාපත් සහිත පියාසැරීමට දක්ෂ කෘබියෙකි, මෙම කෘබියා ප්‍රබල පළිබොධකයෙකු ලෙස ප්‍රකටය.කාව කීට අවස්ථාවේදී විශේෂයෙන් ඇඳුම් ආහාරයට ගනී.එහෙත් මොවුන්ගේ එකම ආහාරය ඇඳුම් නොවේ.

 උප වර්ග 
දැළ් කාවා(Webbing Clothing Moth) (Tineola bisselliella) බහුලව දක්නට ලැබෙන විශේෂයයි

කොෂ සාදන කාවා (Casemaking Clothes Moth) (Tinea pellionella) දැළ් සාදන කාවාට වඩා අඩු වශයෙන් දක්නට ලැබේ.මෙම කාවා අඟල් 1/8 ත් 1/4 අතර ප්‍රමාණයකට විශාලව වැඩේ.කාවා තම කෝෂය සේද වැනි කෙඳි විශේෂයක් යොදාගනිමින් සකසයි.එමගින් මෙම සත්වයා බාහිර උපදුව වලින් මිදී වාසය කරයි.  

ටැපැස්ට්‍රි කාවා(Tapestry or Carpet Moth) කලින් සදහන් කළ දැළ් කාවා හා කොෂ සාදන කාවා සිටින පරිසරයන්හිම වාසය කාරයි.මෙම කාවා අවුරුද්දක පමණ ජීවන චක්‍රයක් පසුකරයි. මොවුන්ගේ වර්ධන වේගය හා පැතිරීම උෂ්ණත්වය ආද්‍රතාවය සහ ආහාර ප්‍රභවයන් මත තීරණය වෙයි.

 පෝෂණය 
The Clothing Moth (Tineola bisselliella) and the Case-bearing Clothes Moth (Tinea pellionella) are notorious for feeding on clothing and natural fibres; they have the ability to turn keratin, a protein present in hair and wool, into food.  Clothing moths prefer dirty fabric and are particularly attracted to carpeting and clothing that contain human sweat or other liquids which have been spilled onto them.  They are attracted to these areas not for the food but for the moisture.  Moth larvae do not drink water; consequently their food must contain moisture.

 වර්ධනය 
The Development Cycle of the Clothing Moth.  Eggs hatch into larvae, which then begin to feed.  Once they get their fill, they pupate and undergo metamorphosis to emerge as adults.  Adults do not eat: male adults look for females and adult females look for places to lay eggs.  Once their job is done, they die.  Contrary to what most people believe, adult clothing moths do not eat or cause any damage to clothing or fabric.  It is the larvae which are solely responsible for this, spending their entire time eating and foraging for food.  

Both adults and larvae prefer low light conditions.  Whereas most other moths are drawn to light, clothing moths seem to prefer dim or dark areas.  If larvae find themselves in a well-lit room, they will try to relocate under furniture or carpet edges. Hand made rugs are a favorite because it is easy for them to crawl underneath and do their damage from below.  They will also crawl under moldings at the edges of rooms in search of darkened areas which hold good food.  

The most common clothing moth is the Webbing Clothes Moth.  It prefers moist conditions, although low humidity will merely slow development.  Webbing Clothes Moths are small moths whose adults grow to between 1 and 2 cm.  Their eggs are tiny, most being under 1 mm long and barely visible.  A female will lay several hundred during her lifetime; egg placement is carefully chosen in locations where they will have the best chance for survival.  The eggs are attached with a glue-like substance and can be quite difficult to remove.  After the egg hatches, the larva will immediately look for food.  Larvae can obtain their required food in less than two months, but if conditions are not favorable they will feed on and off for a long time.  Whether it takes two months or two years, each larva will eventually spin a cocoon in which it will change into an adult.  Larvae stay in these cocoons for between one and two months and then emerge as adults ready to mate and to lay eggs.

 Infestation 

Fabric pests such as clothes moths, although not particularly dangerous, can sometimes cause irreparable damage to personal belongings. These moths are able to digest animal hairs and, therefore, feed on almost any item made of natural fibers, particularly wool and cashmere

 පාලනය 
Control measures can include the following:  

Clothing Moth Traps - This step can help monitor the current infestation and prevent males from mating with females.  

Vacuuming - Since moths like to hide in carpeting and baseboards, this is an important step towards full eradication.  

Dry cleaning - This step kills moths on existing clothing and helps remove moisture from clothes.

Sunlight - has a limited effect

Heat - Extreme high temperatures (120 degrees Fahrenheit or 50 degrees Celsius for 30 minutes plus).  These conditions may possibly be achieved by placing infested materials in an attic,  or by washing clothes at or above this temperature.

Freezing - Freezing the object for several days at temperatures below 32 °F or 0 °C

Dry ice fumigation - Fumigating an object with dry ice, that is enclosing an object with dry ice so it is effectively bathed in a high concentration of carbon dioxide, will kill all stages of clothing moths. For details,see:Clothes Moths Management Guidelines, under "Household Furnishings".

Permethrin - Typically an aerosol or spray works best here.

Nylar - Stops the life cycle.

Mothballs - There are two types of mothball.  Older types are based on napthalene while more recent ones use paradichlorobenzene.  Both decay into a gaseous state.  They fall to the lowest point as a gas and need to reach a high concentration to be effective.

Cedar is of questionable value as a deterrent. While the volatile oil of eastern red cedar, is able to kill small larvae, it is difficult to maintain sufficient concentrations of it around stored articles to be effective. Also, cedar loses this quality after a few years.

Apply the chemical using a sprayer. Be sure to get proper coverage and don't spread it too thinly. Treat once a month for the first three months and then once a quarter for the next year to ensure the infestation is under control.

 References 

 External links 

 Clothes Moths Management Guidelines
 Ohio State University Extension Fact Sheet
 Clothes Moths, Kansas State University 
 No Pests 

ප්‍රවර්ගය:පරිවර්තනය වෙමින් පවතින ලිපි