Pheromone Reproduction in Insects

Posted on: 02 March, 2017

Author: Alexander P

In Ips the alleles which control both production and reception of pheromones are codominant and autosomal. If a male Ips which is heterozygous for a mutant pheromone allele breeds a female which is he... In Ips the alleles which control both production and reception of pheromones are codominant and autosomal. If a male Ips which is heterozygous for a mutant pheromone allele breeds a female which is heterozygous for a receptor allele keyed to the mutant pheromone, 1/4 of the progeny will be doubly heterozygous, l /2 will carry one mutant allele, and 1/4 will carry no mutant alleles. If...

The Best Pheromones are Used by Predators

Posted on: 02 March, 2017

Author: Alexander P

The best pheromones are used by predators which attack and consume adult beetles on a new host as well as ovipositing on the bark of infested trees so that their larvae will be near their prey, the de... The best pheromones are used by predators which attack and consume adult beetles on a new host as well as ovipositing on the bark of infested trees so that their larvae will be near their prey, the developing bark beetle brood. Although Furniss and Schmitz (1971) did not demonstrate that Derzdroctonus pseudotsugae pheromones attracted any more clerids or ostomids than host terpenes,...

Manipulation of Pheromone Signals

Posted on: 02 March, 2017

Author: Alexander P

Individual distance as any other pheromone space varies with the needs or requirements of an individual at a given time. As the production of odor from the skin glands is under the control of sex horm... Individual distance as any other pheromone space varies with the needs or requirements of an individual at a given time. As the production of odor from the skin glands is under the control of sex hormones, individual distances of aggressive animals or those in a pheromone reproductive state will be increased automatically with a repelling or attracting effect depending on their physiological state. Thus...

Pheromones and Bacteria

Posted on: 02 March, 2017

Author: Alexander P

It has been suggested that bacterial strains which can as a rule be found in normal rat’s pheromone may play an important role in shaping the pheromone odor of individual animals (Reiffe 1956). ... It has been suggested that bacterial strains which can as a rule be found in normal rat’s pheromone may play an important role in shaping the pheromone odor of individual animals (Reiffe 1956). The tracks established by rats and mice within their pheromone ranges facilitate not only their own orientation and movements but also those of newcomers. The wolf also displays a similar habit of marking...

Pheromones in Subspecies

Posted on: 02 March, 2017

Author: Alexander P

Cowley and Wise (1970) showed that the activity of 6-day old baby mice is reduced if they are kept in the presence of soiled sawdust or pheromones from a lactating female, whereas activity increases i... Cowley and Wise (1970) showed that the activity of 6-day old baby mice is reduced if they are kept in the presence of soiled sawdust or pheromones from a lactating female, whereas activity increases if they are kept in the presence of stock sawdust. The adaptive significance of this phenomenon is clearly to maintain cohesion in the nest during the preweaning period. Non-estrous females do...

Biological Role of Aggregation Pheromones

Posted on: 02 March, 2017

Author: Alexander P

It is the intent of this article to describe the essential biological role of aggregation pheromones in the processes of scolytid host selection and mass attack. In addition, the role of scolytid pher... It is the intent of this article to describe the essential biological role of aggregation pheromones in the processes of scolytid host selection and mass attack. In addition, the role of scolytid pheromones in guiding associated insects to scolytid-attacked hosts will be examined as outlined in g. 8.2. Specic examples are taken from well researched species to illustrate each step. It is not the intent of this...

Genetic Control of Pheromone Systems

Posted on: 02 March, 2017

Author: Alexander P

Even slight differentiation between the respective pheromones by Marble and Wardle females was surprising because these populations are separated by a distance of only 20 miles over which tridens is c... Even slight differentiation between the respective pheromones by Marble and Wardle females was surprising because these populations are separated by a distance of only 20 miles over which tridens is continuously distributed. The extremely strong discrimination between Marble and Wardle males by females of Swan and Rodgers indicated that the volatiles produced by males of the two populations were even more different than could have been suspected from the...

Pheromone Secretions in Insects

Posted on: 02 March, 2017

Author: Alexander P

A very few components of pheromone secretions have been applied singly to leaves on ight routes and found to make them attractive (Kullen- berg, 1973), but extensive investigations are needed. Kulle... A very few components of pheromone secretions have been applied singly to leaves on ight routes and found to make them attractive (Kullen- berg, 1973), but extensive investigations are needed. Kullenberg (1973) also collected leaves pheromone-marked by Psithyrus bohemicus males and presented them elsewhere in the ight zone; males of P. bohemicus were attracted to them and deposited more scent in the vicinity. In experiments conducted in large cages...

Pheromone scent marking

Posted on: 02 March, 2017

Author: Alexander P

The pheromone scent trails of some species are more effective than honeybee dances in assembling recruits and in addition can provide information on the vertical component (Lindauer and Kerr, 1958). ... The pheromone scent trails of some species are more effective than honeybee dances in assembling recruits and in addition can provide information on the vertical component (Lindauer and Kerr, 1958). However the pheromone scent trail alone of other species appears to be insufficient to elicit trail-following behaviour of recruits who need to be guided by the scout bee to the food on their initial trip, although thereafter they are...

Chemical Specific Pheromones

Posted on: 02 March, 2017

Author: Alexander P

There is little evidence for these pheromones. Indeed, under natural conditions the Nasonov pheromone is effective as an attractant in several different behavioural contexts (i.e. when clustering, at ... There is little evidence for these pheromones. Indeed, under natural conditions the Nasonov pheromone is effective as an attractant in several different behavioural contexts (i.e. when clustering, at the hive entrance, at a source of water) but in each of these situations the nerol and farnesol components appear to have no inuence or are slightly repellent. Frequently two or more pheromones are released during a behavioural situation, sometimes from different castes....