Both aphid species are resistant to most organophosphates, but materials in other chemical classes control these pests effectively. Cygon, Lannate or Vydate. The first adult males of the season began appearing in earnest in pheromone traps late last week, so it shouldn't be long before we start seeing some adult females in pear foliage, followed by their invasive crawler offspring. According to our tests over the past few years, this is the most susceptible stage for chemical control, which we expect sometime during the next couple of weeks, especially in the Hudson Valley. Adult females are present for a total of 4-6 weeks, and oviposit for about one week after mating.
Males survive for only a few days after emerging.
The elongate, orange-yellow eggs are laid in jumbled masses along with waxy filamentous secretions in protected places such as under bark crevices, near pruning cuts, and occasionally in the calyx of fruit. Later instars are similar in appearance, but become progressively browner and redder. This hatch is completed by the petal fall stage of pears. Nymphs that hatch from these overwintered eggs are active from roughly early May to early July. As the nymphs approach the adult stage, they tend to congregate on older branches at a pruning scar, a node, or at a branch base, as well as inside the calyx of pears.