Insecticides gave good control of flies in 1950, and during the same year the infant-mortality rate was reduced by nearly fifty per cent.
The salt sodium fluoroacetate is an extremely powerful rodenticide; it has been reported to give good control of rats, but it must be used with great care.
This arrangement gives good control of burden distribution, since successive portions of the charge can be placed in the furnace as rings of differing diameter.
The control structure using the reactor inlet temperature as TPM gives good control performance when the reactant distribution is held constant.
The broom efficacy work showed that the medium rate selected was too low to give good control of broom (median injury ratings of only 6 or less), whereas the high rate (1.0 kg ae ha−1) gave very good control of broom (median injury ratings of 10 for plants 3, 6 or 9 months old), similar to that obtained by the clopyralid/triclopyr mixtures.
Results from the present study showed that application of terbuthylazine alone at a rate of 5 kg ai ha−1 gave good control (median injury rating of 10) of 6-month-old broom (37 cm tall), although 10 kg ai ha−1 was required to give a similar level of control of 9-month-old broom (62 cm tall).
Terbuthylazine applied in conjunction with an organosilicone surfactant gave good control of 3-, 6- or 9-month-old broom, whereas the rates of hexazinone needed to control older broom were too expensive and caused some phytotoxicity to 12-month-old radiata pine.
Although the highest rate of hexazinone (12 kg ai ha−1) did give good control of broom (median injury rating of 10 for all growth stages tested), this rate was more expensive than alternative treatments (Table 1), and lower rates did not provide adequate control for older broom (median injury rating of 3 or less for broom that was 9 and 12 months old).
The three combinations of herbicides assessed in this trial based on clopyralid gave good control of broom at all rates assessed, though the two mixtures with triclopyr were more effective than the clopyralid/picloram mixture, especially when on 12-month-old broom.
While Bti gives good control initially (within days of application), it does not appear to persist in most situations.
