Carneiro Francisco E, Torres Rogelio R, Strapazzon Roger, Ramírez Sabrina A, Guerra José C V, Koling Diego F, Moretto Geraldo
Depto Ciências Naturais, Univ Regional de Blumenau, Blumenau, SC, Brazil.
Neotrop Entomol. 2007 Nov-Dec;36(6):949-52. doi: 10.1590/s1519-566x2007000600018.
Varroa destructor has been in Brazil for more than 30 years, but no mortality of honeybee colonies due to this mite has been recorded. Africanized bee infestation rates attained by varroa have been low, without causing measurable damage to Brazilian apiculture. The low reproductive ability of this parasite in Africanized bee worker brood cells has been considered an important factor for maintaining the host-parasite equilibrium. Nevertheless, the possible substitution of the haplotype of the mite Varroa destructor that has occurred recently in Brazil could affected the reproductive ability of the population of this parasite in Brazil. The reproductive ability of worker of the mite females was evaluated in over one thousand 17-18 day-old Africanized worker brood cells each of the two periods. The percentage of fertile mites increased from 56% in the 1980s to 86% in 2005-2006. The difference in the percentage of females that produced deutonymphs, female progeny that can reach the adult stage at bee emergence, was even greater. In 2005-2006, 72% of the females that invaded worker brood had left at the least one viable descendant, compared to 35% in 1986-1987.
狄斯瓦螨已在巴西存在30多年，但尚未有因这种螨虫导致蜂群死亡的记录。狄斯瓦螨对非洲化蜜蜂的侵染率一直很低，未对巴西养蜂业造成明显损害。这种寄生虫在非洲化蜜蜂工蜂幼虫细胞中的低繁殖能力被认为是维持宿主 - 寄生虫平衡的一个重要因素。然而，最近在巴西发生的狄斯瓦螨单倍型的可能替代可能会影响这种寄生虫在巴西种群的繁殖能力。在两个时期中，分别在一千多个17 - 18日龄的非洲化工蜂幼虫细胞中评估了螨雌虫的繁殖能力。可育螨虫的百分比从20世纪80年代的56%增加到2005 - 2006年的86%。能产生若螨（在蜜蜂羽化时可发育到成虫阶段的雌性后代）的雌螨百分比差异更大。在2005 - 2006年，侵入工蜂幼虫的雌螨中有72%至少留下了一个存活后代，而在1986 - 1987年这一比例为35%。
