Tetranychus urticae adults

Results from these laboratory studies demonstrated that avermectin Bj had high toxicity for the twospotted spider mite (Tetranychus urticae) on bean plants. When applied in solution directly onto adult and nymphal spider mite populations on foliage, avermectin Bj was shown to be 50-200 times as potent as commercially available acaricides, with an LC q of 0.02-0.03 ppm. Additional tests on foliage with insects in the order Lepidoptera, Coleoptera, Homoptera, Orthoptera, Diptera, Isoptera and Hymenoptera confirmed the broad spectrum activity and potency of the avermectin family of compounds and avermectin Bj in particular. Table II provides LC q values for avermectin Bj for the control of larval forms of several of these insects in foliar residue assays (18). 

Chlorfenethol, prochlonol and dicofol are powerful acaricides, but they differ with respect to their spectrum of activity. Characteristic of chlorfenethol (2) is its strong ovicidal. action, while the effect of dicofol (4) is directed mainly to more developed stages. The most characteristic feature of prochlonol (3) is its rapid onset of action. Its activity against adults of Tetranychus urticae is about the same as that of dicofol (4) its residual ovicidal activity, however, proved to be markedly better. Prochlonol shows interesting plant growth stimulation, resulting in better performance of the leaves and bigger fruits (Busschots, 1967). 

A similar stage sensitivity pattern has been observed in leaf dip tests with the mite Tetranychus urticae at the rate of 200 mg-a.i. larvae and adult females were more susceptible than nymphs while egg hatch was insufficiently controlled [15]. More recently, the sensitivity of different developmental stages of the carmine mite Tetranychus cinnaharinus towards diafenthiuron has been determined and compared with dimethoate and propargite [62]. 

Tetranychus urticae (twospotted spider mite) Adults 4.7... 

Bifenazate shows a broad activity spectrum on phytophagous mites such as Tetra-nychus spp. Eutetranychus spp., Oligonychus spp. and Panonychus spp. Compared with propargite the compound is 30-100-fold more active against adults, nymphs and larvae, e.g., of Tetranychus urticae (in cowpeas) [3] (Table 30.2.4). 

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