Degree-day model will help growers time citrus leafminer sprays

04/15/2013 12:17:00 PM
Moneen M. Jones, Philip A. Stansly and Joseph M. Russo

citrus leafminer phenology modelFigure 3. Phenology or flight of CLM in a grove with 3 applications of nutritionals/year, frequent flushing and 7 generations. (Click image to view larger version)Results so far show strong deviation in the number of generations (2-7) of CLM per year (Fig 3). The number of peak flights coincides with the number and intensity of flushing periods as well as grove management practices.

Published records of P. citrella growth based on temperature will be used to develop a prediction model for moth flights. Using the lower threshold of 10.4 degrees Celsius (50.7 degrees Fahrenheit), the egg, larval and pupal periods in days can be translated to degree-days.

Degree-day accumulations at the research sites will be based on temperature data obtained from the Immokalee weather station, which is part of the Florida Automated Weather Network or FAWN.

Prediction of first and second generations will be calculated by adding the number of degree-days between the start of egg laying (i.e. moth flight) and peak moth flights. This information will be available on our website in a degree-day table and an online degree-day calculator that will benefit citrus growers by informing them of the best possible time to spray for CLM control.

Dr. Philip A. Stansley is a professor of entomology and nematology at the Southwest Florida Research and Education Center. He can be reached at Dr. Moneen M. Jones is a post-doctoral research associate in integrated pest management. Dr. Joseph Russo is president of ZedX Inc., Bellefonte, Pa.

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