Long‐lasting prevention against blowfly strike using the insect growth regulator dicyclanil

Abstract

Under Australian field conditions, a ready-to-use 5% spray-on formulation of dicyclanil applied off-shears or to long wool protected Merino sheep from blowfly strike for a period of at least 20 weeks.

Prevention of blowfly strike on coarse and fine woolled sheep with the insect growth regulator dicyclanil

“…Studies in Australia using the same dicyclanil formulation showed that the length of protection was approximately the same in Australian Merino sheep treated in long wool or shortly after having been shorn. 11 In the present study all three sites with the highest cumulative strike rate (sites 3, 4, and 5) had relatively short wool (4 to 5 weeks of growth) at the time of product application. Nevertheless, at sites 1, 6, and 8 where the sheep had similar wool length at the time of product application (4 to 6 weeks of growth) the cumulative strike rate was clearly lower.…”

“…A length of protection for fine woolled sheep of 19 weeks and beyond is consistent with results obtained using the same dicyclanil formulation on Merino sheep in Australia, where the cumulative strike rate for dicyclanil treated sheep reached 1% around week 20 after treatment, and 2% around week 26 after treatment. 11 Wool length at the time of application varied between four and 24 weeks of growth (Table 1). Studies in Australia using the same dicyclanil formulation showed that the length of protection was approximately the same in Australian Merino sheep treated in long wool or shortly after having been shorn.…”

“…Field studies on Merino sheep in Australia resulted in periods of protection against flystrike of 20 weeks and beyond. 11 The current investigation was carried out to evaluate the efficacy of a ready-to-use, 5% spray-on formulation of dicyclanil as a preventive of blowfly strike on coarse and fine woolled sheep under New Zealand field conditions.…”

Survival over winter and spring emergence of Lucilia cuprina (Diptera: Calliphoridae) in south‐eastern Australia

“…Insecticides chosen for this treatment have to be relatively long‐acting because of the drawn out nature of the spring emergence, typically from 4 to 7 weeks (Table 2). The availability and ease of application of insect growth regulators to protect sheep against strike for periods of 10–20 weeks are ideal for this purpose (Bowen et al . 1999).…”

Ecosmart Biorational Insecticides: Alternative Insect Control Strategies

“…Dicyclanil (ZR ®, ComWin ®), a pyrimidine derivative, is highly active against dipteran larvae and available as a pour-on formulation for blowfly control in sheep in Australia and New Zealand providing up to 20 weeks' protection (Bowen et al, 1999). On the whole, most CSI compouns are very potent against a variety of different pests, especially lepidopterous insects and whiteflies.…”