Termite: the most potent biodeteriogen
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Transcript of Termite: the most potent biodeteriogen
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The most potent Biodeteriogen.
Life Cycle , Effects and its Controls..
Presented by:
Kamaljit Kshetrimayum
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Introduction:
Termites are social insects living in colonies. Each colony contains specialized castes, or types of individuals, such as reproductives, workers and soldiers, that performs different jobs.
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Reproductive caste
Reproductives, king and queen can be winged (primary) or wingless (secondary).
Each queen has the capability to lay eggs. Winged reproductives are called alates or swarmers and
the wingless are de-alates. Alates are the only caste not living underground or
within wood. Alates themselves neither cause damage to structures
nor physical harm to people. Life span of a queen can be as much as 30 years.
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Fig: Reproductive: King and Queen
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Workers
Sterile, wingless and blind males and females. They are soft-bodied, creamy-white wingless and make
up the largest number of population within a colony. The workers and immatures are the only caste that
damages wood and other materials. Workers build mud tubes and tunnels, forage for and
obtain food to feed themselves and the entire colony, construct and maintain nests, and care for eggs and young.
Worker’s life span is one to five years.
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Fig: Worker
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Soldiers Like workers, they are sterile, wingless and blind
males and females. They defend their colony from intruders. They can’t feed themselves, they have to be fed
by workers. Usually the number of the soldiers is much smaller
than the number of workers. Their life span is one to two years.
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Fig: Soldier
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Biodeterioration and Biodeterioration and BiodeteriogensBiodeteriogens Biodeterioration is a term that includes all types of damage caused
by living entities like insects, fungi, bacteria and actinomycetes making the material unsuitable for its intended use.
S.M. Nair (1972) defined Biodeterioration as “any undesirable change in the properties of the material caused by vital activities of organisms”
The agents causing Biodeterioration is known as Biodeteriogens.
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Taxonomy Termites are broadly grouped into nine families, namely1) Mastotermitidae
2) Kalotermitidae
3) Termopsidae
4) Hodotermitidae
5) Rhinotermitidae
6) Stylotermitidae
7) Serritermitidae
8) Termitidae
9) Indotermitidae
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Classification
Termites are classified into- Tree dwelling termites Damp wood termites Dry wood termites Subterranean termites
In the conservation of buildings and monuments and in museums the dry-wood termites and the subterranean termites are of principal significance.
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Separating Termites from Ants The first step in managing any insects is to
identify it correctly. People usually confuse termites and ants
of their similar appearances. Termites are not ants and certainly not
white ants. Ants do not eat wood, though some ants
tunnel through wood and live in it.
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Termite Vs AntsAntsAnts TermitesTermites
AntennaeAntennae ElbowedElbowed Straight and Straight and beadlikebeadlike
WaistWaist Very narrow Very narrow (constricted)(constricted)
BroadBroad
WingsWings Front wings larger Front wings larger than the hind wings than the hind wings
Equal sized front Equal sized front and hind wingsand hind wings
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Life Cycle
Termites undergo an incomplete transformation (Hemi-metabolism)
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Life Cycle
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Effects(Deterioration caused by termites)
Termites are able to destroy almost all kinds of organic materials and so are also described as the most potent bio-deteriorating agent.
Termites are cellulose-feeding insects.
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The damages are largely done by the workers who are responsible for feeding the entire community.
Besides all kinds of crops, they damage wood works, paper materials, textiles and also the building structures.
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Wooden Objects
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Textiles
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Paper and Archival materials
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Buildings
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ControlsIn order to apply suitable protective and control
methods or treatments, knowledge of occurrence and habit are very important (Richardson 1993; Creffield 1996).
Apart from the general methods used for storage of materials, the following special methods as suggested by R.C.Gupta (1954) and others may be adopted for controlling termite damage.
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Using ‘Hygienic’ storage, keeping materials above ground and allowing space all around for easy inspection. Not to dump books or other vulnerable materials on the floor and against walls.
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Where books are stored in almirahs made of untreated wood, the legs should be stand in cups containing either coal-tar and creosate-kerosine oil mixture (1:2) or phenyl in strong water solution.
Alternatively, the wood all over is brush-coated with either Chlorophenol- napthanol -petroleum mixture (1:1:40, 2 coats), or 20% water solution of zinc chloride (3 coats) or hot coal tar creosote (3 coats)
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Fumigation is the most effective means of eliminating dry-wood termites.
The floors and walls of libraries should be free of cracks as subterranean termites can enter through them.
Fresh infection maybe eradicated by blowing dust insecticides such as B.H.C, aldrin, dieldrin, chlordane etc.
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Termites Toxicants
Four termites toxicants are recognized in the United States as the most effective and long lasting of those tested to date for control of Subterranean termites (Johnston, 1963, and personal communication, 1963).
It is recommended by National Pest Control Association,1965 that any of the four can be applied as an emulsion in water.
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Toxicants Concentrations
Aldrin(actual) 0.5% by weight
Chlordane(technical) 1.0% by weight
Dieldrin(actual) 0.5% by weight
Heptachlor(actual) 0.5% by weight
Combination of these toxicants is acceptable as long as proportioned to provide the equivalent of the full reference concentration.
Toxicants and recommended reference concentrations:
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Conclusion
Regardless of the refinement of the present techniques and sophistication of new principles of termite control, their efficient use requires a
sound understanding of the biology of termites.
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Thank you..