Cockroaches are wide in distribution but more prominent in sub - tropical countries . They are nocturnal and found to be present in dark and humid places such store rooms , bakeries , kitchens , boards , pictures , cracks , round sinks In day light they hide behind cup - boards and heating pipes . Adult and nymphal stages both cause damage . P . americana is commonly found in South India . It is about 3 . 5cm in length and brown in colour . Shelfordella tartara is commonly found in northerm states of | India . is about cm in length and Cockroach ( Periplaneta americana ) . shining black in colour . The cockroaches provided with one pair of very long antennae which function as tactile organ . '
Damage
Thecockroaches touch and pollute every thing which is palatable and prefer to feed on potatoes , vegetable , bread , chocolate sugar , honey , fat , , old damped books , leather material etc . They may spread diseases viz , tuberculosis , cholera , dysentary and typhoid .
Life cycle
Cockroaches breed continuously in warm house even in winter . They look more active in hot and humid regions . The fertilized female of P . americana lays eggs which are enclosed in a bag like structure called ' Dotheca ' . One fertilized female can lay 15 to 90 capsules having 16 eggs in each capsule . After interval of 35 10 100 days of laying . 16 nymphs come out of cach ootheca which take 10 10 months and 13 moults to attain adult stage The female of lartara lays cigar shaped eggs in bag - like capsules . After 2 days of laying . nymph emerges from egg but in winter it takes few weeks . After one month nymphs attain adult stage .
Prevention and control.
(1) As cockroaches are annoying . immediate steps should be taken to control them . )(2) prompt removal of food remnants and cleanliness is essential measure to control . (3) Spraying of 2 % oil solution or emulsion of chlordane is very much effective .
(4) Spraying sodium fluoride with pyrethrum powder containing 0 . 5 to 1 % Pyrethrin may be very effective .
(5) Spraying of0 . 5 % dieldrin in liquid formulation and 1 % in dust formulation is also effective .
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.
ConversionConversion EmoticonEmoticon