Lasiognatha cellifera was one of the main defoliators for the Aegiceras corniculatum which was main tree of mangrove, and identified as new record of species in China L. cellifera had 7 generations per year in Zhangzh...Lasiognatha cellifera was one of the main defoliators for the Aegiceras corniculatum which was main tree of mangrove, and identified as new record of species in China L. cellifera had 7 generations per year in Zhangzhou area, Fujian Province and overwintered as pupa in the rolled leaf. Adult moth emerged in last-May, mating and laying egg on back of leaf soon. Egg period lasted 5d, larvae period lasted 13～17d, pupa periods lasted about 6d but overwinter-pupa lasted about 150d, adult moth life-span was 4～5d. The periods were related to the diversification of temperature, and the periods decreased with the increase of temperature. A. corniculatum in the front of seashore were harmed seriously for the reason that they growed weakly and L. cellifera was not adept in flying. Protecting natural enemies such as bird, parasitism etc., alluring adult moth, spraying Dimilin Ⅲ in 2 000 concentration when it occurred seriously will control L. cellifera effectively.展开更多
Latoia lepida is one of the main defoliators for the mangrove forest. The survey in the forest revealed that L.lepida principally distributed on the middle and upper parts of crown, the position soaked by seawater for...Latoia lepida is one of the main defoliators for the mangrove forest. The survey in the forest revealed that L.lepida principally distributed on the middle and upper parts of crown, the position soaked by seawater for short time gradually decreased from the internal beach to the external beach, the average injured percentage was 46.3% on the internal beach (high tide position), and the average injured percentage was only 13.8% on the external beach (middle tide position). The seawater soak-resistant experiment indicated that the influence of different soak times existed the extremely marked different on L.lepida survival rate, the population mortality rate increased with the increase of soaking time after soaking for more than 4 h, the population mortality reached the peak at the time of soaking for 8 h, and then the population survival rate stabilized to a certain level. The difference was not obvious among various-generation larval adversity resistance, the difference was evident among various-instars larval adversity resistance, the adversity resistance of larvae on seawater soaking was the main reason for the larval population distribution law and the large outbreak of L.lepida in the forest.展开更多
连续调查了木麻黄抗星天牛品系子代及母本的平均被害率和胸径,结果表明:抗虫品系母本9 a 平均被害率,除 C_(45)为0.54%外,其余5个品系均为0;其无性繁殖子代7 a 平均被害率均为0。说明这些木麻黄品系具有极强的抗星天牛性能,且不因环境...连续调查了木麻黄抗星天牛品系子代及母本的平均被害率和胸径,结果表明:抗虫品系母本9 a 平均被害率,除 C_(45)为0.54%外,其余5个品系均为0;其无性繁殖子代7 a 平均被害率均为0。说明这些木麻黄品系具有极强的抗星天牛性能,且不因环境条件、时间和无性繁殖技术的影响而改变,具有极强的抗虫稳定性。以胸径、树高、造林保存率和星天牛发生率等为指标,综合评判出 C_(39)、C_(40)既抗星天牛又生长较好的抗虫品系;莆_(19)和平_(18)为生长优良、抗虫性较强的优良广谱家系,可在各地应用。展开更多
文摘Lasiognatha cellifera was one of the main defoliators for the Aegiceras corniculatum which was main tree of mangrove, and identified as new record of species in China L. cellifera had 7 generations per year in Zhangzhou area, Fujian Province and overwintered as pupa in the rolled leaf. Adult moth emerged in last-May, mating and laying egg on back of leaf soon. Egg period lasted 5d, larvae period lasted 13～17d, pupa periods lasted about 6d but overwinter-pupa lasted about 150d, adult moth life-span was 4～5d. The periods were related to the diversification of temperature, and the periods decreased with the increase of temperature. A. corniculatum in the front of seashore were harmed seriously for the reason that they growed weakly and L. cellifera was not adept in flying. Protecting natural enemies such as bird, parasitism etc., alluring adult moth, spraying Dimilin Ⅲ in 2 000 concentration when it occurred seriously will control L. cellifera effectively.
文摘Latoia lepida is one of the main defoliators for the mangrove forest. The survey in the forest revealed that L.lepida principally distributed on the middle and upper parts of crown, the position soaked by seawater for short time gradually decreased from the internal beach to the external beach, the average injured percentage was 46.3% on the internal beach (high tide position), and the average injured percentage was only 13.8% on the external beach (middle tide position). The seawater soak-resistant experiment indicated that the influence of different soak times existed the extremely marked different on L.lepida survival rate, the population mortality rate increased with the increase of soaking time after soaking for more than 4 h, the population mortality reached the peak at the time of soaking for 8 h, and then the population survival rate stabilized to a certain level. The difference was not obvious among various-generation larval adversity resistance, the difference was evident among various-instars larval adversity resistance, the adversity resistance of larvae on seawater soaking was the main reason for the larval population distribution law and the large outbreak of L.lepida in the forest.
文摘连续调查了木麻黄抗星天牛品系子代及母本的平均被害率和胸径,结果表明:抗虫品系母本9 a 平均被害率,除 C_(45)为0.54%外,其余5个品系均为0;其无性繁殖子代7 a 平均被害率均为0。说明这些木麻黄品系具有极强的抗星天牛性能,且不因环境条件、时间和无性繁殖技术的影响而改变,具有极强的抗虫稳定性。以胸径、树高、造林保存率和星天牛发生率等为指标,综合评判出 C_(39)、C_(40)既抗星天牛又生长较好的抗虫品系;莆_(19)和平_(18)为生长优良、抗虫性较强的优良广谱家系,可在各地应用。
