Effective accumulated temperature analyzer to analyze the effective accumulated temperature of the development of longan pests

August 13 06:04:31, 2019

In recent years, it has been common in Minzhong and Weinan, and the damage has been severe in some areas. They damage young shoots and young leaves of longan, causing new shoots and young leaves to fall off earlier. They have a greater impact on tree vigor and normal growth and development, especially in the summer and autumn shoots, which directly affect the formation of mother trees. . Due to the fact that they have more generations and more generations overlap, it is more difficult to control them. The research and determination of the developmental starting temperature and effective accumulated temperature of the insects are important for the medium and long-term forecasting and forecasting, and clarification of the number of generations in all regions. At the same time, it also provides a theoretical basis for the formulation of control strategies in Changfa District. The effective accumulated temperature not only affects the growth of the plant, but also has a certain influence on the growth and development of insect pests. The effective accumulated temperature analyzer can effectively measure the effective accumulated temperature.

The growth and decline of the population of Litchi nymphis are affected by natural enemies, host and climate factors. A field survey showed that the population of the worm began to grow in April and increased with the increase in temperature. The peak period of the population was from August to September, followed by a decline. This indicates that the temperature is an important factor influencing the population growth of the fine-spotted moth. one.

The measurement results of the effective accumulated temperature analyzer showed that in the range of the measurement temperature (18~30e), each of the larval moths could develop normally. At 18e, 5117 days were needed for the whole generation, and 20126 days at 30e, 24-30e. The fastest rate of development within the range, more than 30e adverse to the development of warts, the mortality of warts increased.

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