Studies on the Forecast of Occurrence and Evaluation of Control Effect of Hyphantria cunea Based on Normal Distribution and Effective Cumulative Temperature
There are signs in SPSS tests that the daily mergence amount and proportion in totality of Hyphantria cunea obeys normal distribution.It is given that effective cumulative temperature of peak day from adult to adult is 877.6±84.3 day degree and,cumulative effective cumulative temperature of peak day from the beginning of the year is 309.3±31.5 day degree by which can forecast the adult quantity of this generation and next generation by the aid of change trend indicator of adult population.Under the guide of TPM and APM,two ideas have been put forward which are called space coverage and population coverage and,provide a series of equations to evaluate death amount of larval population,which has been tested to be reliable in the past control by aerial spray.
Hyphantria cuneaforecastmathematical modelnormal distributioneffective cumulative temperaturecontrolretroactive test
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