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Application of thermic constants in the control of cattle tick boophilus microplus iv. prediction of eclosion onset in outdoor conditions



Application of thermic constants in the control of cattle tick boophilus microplus iv. prediction of eclosion onset in outdoor conditions



Revista de Salud Animal 8(4): 337-345



In previous papers the thermic constants for eclosion onset of Boophilus microplus in constant incubation conditions were determined. Likewise, a method for the appraisal of eclosion onset in conditions where enviromental temperature and humidity were variable throughout the day was corroborated, ticks being kept indoors. Different simplifications of said method were carried out that made easier its application in production conditions. The present paper deals with a simplified method to predict the period from the drop of the engorded female to the emergence of first larvae in outdoor conditions. Groups of 15-70 ticks were placed on soil within pots, 2-3 ticks per pot. Mean daily temperature was calculated by the temperatures registered in a maximum-minimum thermometer. A method to calculate the sum of effective temperatures of ticks, and predict non-eclosion was established. Larvae eclosion did not occur before non-eclosion prediction in none of the six replicates. For the rotation of cattle from one deparasitation paddock to another when mean daily temperatures range 24 to 26.degree. C, the limit 275.degree. C-day is preventive (1 week) and 328.degree. C-day is alarm (2-4 days).

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Accession: 004774969

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Related references

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