Single and Multiple Applications of Fenvalerate to Protect Western White Pine Cones from Dioryctria abietivorella (Lepidoptera: Pyralidae)1
1986; Oxford University Press; Volume: 79; Issue: 1 Linguagem: Inglês
10.1093/jee/79.1.158
ISSN1938-291X
AutoresMichael I. Haverty, Patrick J. Shea, Lawrence E. Stipe,
Tópico(s)Plant Pathogens and Fungal Diseases
ResumoCones of blister rust-resistant western white pine were treated with highvolume ground applications of 0.025% fenvalerate during spring and summer 1984. Four treatments were compared: an untreated check, a single application (9 May), a double application (9 May and 13 June), and a triple application (9 May, 13 June, and 18 July). Dioryctria abietivorella (Grote) infested 46.6% of cones in the untreated check, significantly more than the 13.6% in the single application. The double application increased seed yield significantly compared to the untreated check from 31.3 to 56.0 seeds per cone. We are 95% confident that this treatment increased seed production by at least 30% and possibly as much as 128%. The third application in July was apparently unnecessary.
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