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A comparison of 3 insecticides (selamectin, fipronil, imidacloprid) showed that selamectin reduced larval cat fleas ≥93.5% after 24 h at doses of ≥0.3 μg. In contrast, at 24 h neither fipronil nor imidacloprid reached 90% reduction, even at the highest doses tested (0.5 μg for fipronil and 5.0 μg for imidacloprid).
Cat fleas are holometabolous (undergo complete metamorphosis) insects and therefore go through four life cycle stages of egg, larva, pupa, and imago (adult). Adult fleas must feed on blood before they can become capable of reproduction. [10] Flea populations are distributed with about 50% eggs, 35% larvae, 10% pupae, and 5% adults. [11]
A flea can jump 60 times its length in height and 110 times its length in distance, equivalent to a 1.8 m (6 ft) adult human jumping 110 m (361 ft) vertically and 200 m (656 ft) horizontally. Rarely do fleas jump from dog to dog. Most flea infestations come from newly developed fleas from the pet's environment. [6]
The alligator weed flea beetle and two other biological controls were released in Florida, greatly reducing the amount of land covered by the plant. [18] Another aquatic weed, the giant salvinia (Salvinia molesta) is a serious pest, covering waterways, reducing water flow and harming native species.
The spokesperson further stated: "On the one hand, the chemical companies say we risk the additional costs to farmers amounting to £630 million. On the other, the possible cost of losing pollinating insects is thought to be worth three times as much (£1.8 billion*) to UK farmers." [80]
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