The Primary Judgment
14It appears that a good deal of argument was devoted at the trial to whether the Bootles owed a non-delegable duty of care to the Barclays on the principles stated by the High Court in Burnie Port Authority v General Jones Pty Ltd [1994] HCA 13; 179 CLR 520 ("Burnie"). Presumably for that reason, his Honour examined in some detail whether the spraying of herbicides was a sufficiently dangerous activity to warrant the imposition of a non-delegable duty of care on the occupier of the land being sprayed.
15In that context, his Honour identified (at [108]) three significant characteristics of glyphosate when sprayed from the air:
(1) Once in the air it basically cannot be controlled
(2) It is damaging to healthy productive plant material on contact
(3) It is likely to kill healthy plant material and thus reduce production.
16His Honour concluded (at [109]) that:
the combined effect of the magnitude of the foreseeable risk of an accident happening, the inability to control the substance once released and the foreseeable potential damage are such that a reasonable person would consider it necessary to take special precautions in relation to it.
17The primary Judge rejected a submission by Mr Bootle that he did not owe the Barclays a duty of care because BBM was the occupier of Bonna and he was merely a lessor. His Honour considered (at [73]) that Mr Bootle was the "hand and mind" behind the occupation and use of Bonna. Thus, for relevant purposes "Mr Bootle was BBM and BBM was Mr Bootle". Furthermore, in his Honour's view (at [74]), while BBM entered an agreement with MVAS for the latter to spray glyphosate on Bonna, the agreement came about at the "behest" of Mr Bootle. To argue that Mr Bootle did not contract with MVAS was "simplistic and ignore[d] the reality on the ground".
18The primary Judge found that all four defendants had breached their duty of care to the Barclays. He reached this conclusion because each could (and presumably should) have called off the spraying on the Pine and Taxi paddocks on Bonna on 6 July 2005. His Honour reasoned as follows:
75 What is factually true is that neither Mr Bootle nor BBM actually carried out any aerial spraying. The individual who did that was Mr Shapley. But that spraying was at the direction of Mr Bootle and BBM. Although neither Mr Bootle or BBM or MVAS had control over how the plane was flown, anyone of those entities could have directed the pilot not to engage in aerial spraying on the day in question.
76 It is important to emphasise that the prime cause of the damage occurring on the day, did not arise out of the manner in which the plane was piloted, including choice of droplet size and nozzle angle, but because the weather was unsuitable in all the circumstances due to the wind speed and direction. That damage was, in my view, prima facie preventable by either Mr Bootle or BBM or MVAS telling Mr Shapley not to spray on that day or by Mr Shapley himself deciding not to spray in the prevailing conditions...
...
80 ... I do agree with the submission that if Mr Bootle had a duty of care [then] that was a duty of care no less nor greater than that owed by BBM.
81 I think the situation needs to be put in perspective. Here we have two farmers with significant common land boundaries engaged in the production of cereal crops to feed humans and lucerne crops to feed animals. In order to control weed infestations over large areas requires broad acre spraying of glyphosate and other herbicides with the obvious and real risk of such herbicides damaging productive crops. A balance has to be weighed between economics and the risk that if your decision to spray in conditions that result in damage to your neighbours crop, then you may be absolutely liable for any consequential damage.
82 ... [T]he fault in this case is not in the methodology of the operation but in the decision to carry out the aerial spraying on the day in question, rather than ground spray or spray on another more suitable day. This is not an issue as to the skills of the pilot, the nature of the herbicide, the patterns of spraying, the control of the aircraft but simply whether or not aerial spraying should have been conducted on that day having regard to all the circumstances.
83 Having regard to the expert evidence and the risks involved in the given climatic conditions, aerial spraying should not have been carried out where there was a risk of terminal damage to a neighbours crop. Had the aerial spraying been of some benign substance, we would not be here, but what was sprayed was a substance fatal to both good plants and bad and thus in my view what was said in Burnie Port Authority is apposite.
...
91 There is no doubt that all the defendants were well aware of the risks attaching to the use of glyphosate both from long experience in the agricultural industry and from previous problems of overspray between the properties in 2003. Although any such damage was denied by Mr Bootle, having regard to some problem in the former good relationship between Mr Bootle and Mr Barclay, apparently an amount of $3,000 was paid for its nuisance value by Mr Bootle to Mr Barclay for what I understand to be an overspray in that year.
...
110 An occupier or user of farm premises cannot, once a decision is made to aerial spray a noxious substance, simply pass over responsibility to either or both the pilot or the aircraft company. Whilst the flying of an aeroplane is a specialised activity that would be beyond the control of someone like Mr Bootle, what is to be sprayed, where and when is not. I would expect that a broad acre farmer would have developed experience of the types of conditions likely to generally impact on aerial spraying activity. In Mr Bootle's case, he was aware that his neighbour had emergent crops which were more likely to be adversely affected by glyphosate than more mature plants. Mr Bootle could have directed MVAS not to engage in spraying on that day, or used ground spray equipment instead, as he was and had already been doing. Because he was 2 weeks behind and needed to have those paddocks treated, he decided on aerial spraying, knowing the nature and quality of the extra risk involved as apposed to ground spraying, which is also not without risk.
...
112 In the circumstances I am satisfied, as per Burnie, that liability exists in the first and second defendants as it does for the third and fourth defendants. I am satisfied that each is jointly and severally liable for damage caused by the aerial spraying in terms of the Civil Liability Act and the common law. (Emphasis added.)
19The primary Judge then dealt with the Barclays' claim against MVAS and Mr Shapley under the DA Act. To follow his Honour's reasoning, it is sufficient to note ss 10 and 11 of the DA Act, which are the key provisions:
10 Liability for injury, loss etc.
(1) This section applies if a person or property on, in or under land or water suffers personal injury, loss of life, material loss, damage or destruction caused by:
...
(c) an impact with a person, animal or thing that dropped or fell from an aircraft in flight; or
(d) something that is a result of an impact of a kind mentioned in paragraph ... (c).
...
(2) If this section applies, the following people are jointly and severally liable in respect of the injury, loss, damage or destruction:
(a) the operator of the aircraft immediately before the impact happened;
(b) the owner of the aircraft immediately before the impact happened;
(c) if the operator of the aircraft immediately before the impact happened was authorised to use the aircraft but did not have the exclusive right to use it for a period of more than 14 consecutive days - the person who so authorised the use of the aircraft;
...
11 Recovery of damages without proof of intention, negligence etc.
Damages in respect of an injury, loss, damage or destruction of the kind to which section 10 applies are recoverable in an action in a court of competent jurisdiction in Australian territory against all or any of the persons who are jointly and severally liable under that section in respect of the injury, loss, damage or destruction without proof of intention, negligence or other cause of action, as if the injury, loss, damage or destruction had been caused by the wilful act, negligence or default of the defendant or defendants.
20His Honour made the following findings:
- The DA Act applied (at [141]); no express finding was made as to the basis for that conclusion, but the parties accept that the most likely basis for that holding was that s 9(4)(b) was satisfied because the owner of the aircraft, Bundambar, was a trading corporation;
- Mr Shapley was the user of the aircraft on 6 July 2005 and thus was the "operator" of the aircraft within the definition in s 6 of the DA Act (at [130]);
- MVAS came within s 10(2)(c) of the DA Act because Mr Shapley was authorised to use the aircraft only for each particular spraying operation and it was MVAS that authorised him to use the aircraft on each occasion (at [131]);
- Mr Shapley was not an employee of XS and thus could not claim the protection of s 7 of the DA Act (which exempts from liability an employee who uses an aircraft in the course of his or her employment) (at [134]); and
- the spray was a "thing that dropped or fell from an aircraft" within the meaning of s 10(1)(c) of the DA Act (at [140]).
21The primary Judge concluded (at [141]) that the DA Act applied to MVAS and Mr Shapley and that both were "vicariously liable" for any damage caused to the Barclays' crops. It is not clear what his Honour meant by the word "vicariously" in this context.