Observations of the biological behavior of Carpophilus dimidiatus,a new pest of macadamia nut
Carpophilus dimidiatus(Fabricius),a new pest of macadamia nut,has been recently found in the macadamia plantation area in Xishuangbanna of Yunnan Province.To accurately understand its biological be-havior,C.dimidiatus was raised indoor with macadamia nut kernels to observe the morphology of different developmental state,adult mating behavior and oviposition characteristics,and detect the egg hatching rate and survival rate of different state.The results showed that the development of C.dimidiatus went through four stages of egg,larva,pupa and adult.The larva had three instars.The body length,body width and head width were gradually increased with the increase of instars.Adults did not immediately mate after emergence.The premating period was(4.65±0.04)d(SE).The mating time was variable,with average length of the first mating time at(13.78±0.29)min,and competition did occur between males to mate with females.The oviposition prophase of female adult was(8.65±0.03)d,averaged with(1.94±0.06)eggs for its first-ovi-position.The period of highest oviposition was between 15:00 and 18:00,with a selection preference to the spawning position.The backlit side of egg landing rate was extremely significantly higher than that of the light side.The egg hatching rate was gradually increased with the increasing of humidity.Under the conventionally feeding conditions,the survival rates of eggs,1st instar larvae,2nd instar larvae,3rd instar larvae and pupae was(86.50±0.69)％,(83.31±2.99)％,(94.85±0.71)％,(97.09±1.46)％and(98.77±1.23)％,re-spectively.
万方数据
维普
