Spraying programmes

Press, Volume CXI, Issue 32702, 3 September 1971, Page 17

Spraying programmes

In order that spraying of fruiting subjects is effective and timely it is wise to adhere to a programme which covers the most important stages during the year, not overlooking that additional treatment is sometimes necessary.

It is possible to devise a number of equally effective schedules, based on growth stages of fruiting subjects, incorporating any of the numerous materials available today. Some of them deal specifically with a major pest or disease and others are more general but perhaps not quite as good for a particular problem. The main thing in devising the schedule, however, apart from its effectiveness, is to make it simple and to adhere to the materials selected. Do not change unless there is absolute certainty that they are not providing a good control.

Become fully conversant with what you use before even opening the receptacle in which it is held. Maker’s instructions should be fully understood so that preparation, dilution rate, toxicity, compatability and uses are known before applying any spray. All the necessary information will be found printed on the wrapper. Mix thoroughly and break down any lumps in powders which do not dissolve readily, a factor which is now rare with the very finely ground materials available today. When making up a combination of sprays check on their compatability or otherwise.' An incompatible material is one which cannot be mixed with certain others for one or possibly several reasons. Examples of incompatibility occur between carbaryl and summer oil, lime sulphur and captan, and others.

Observe the waiting period recommended before a sprayed fruit is safe to eat and never spray any plants which are in flower as this is a breach of the Apiaries Act. The best time to spray is during calm weather, preferably in fine warm conditions such as early morning, to enable the material to dry and/or be absorbed fully by the plant. Check spraying equipment

thoroughly, putting water through it first to ensure that it is functioning correctly before applying any spray. Also ascertain beforehand the exact capacity of the spray reservoir so that the correct sd’ength of dilution can be prepared. application is the only way of achieving satisfactory results. This is particularly necessary when spoaying top fruits as the teijninal shoots are often givten unsatisfactory coverage*. Generally it is necessary to repeat an application if raint falls immediately after spraying. Continued spells of warm but wet wealher can also mean that dangers from certain diseases are increased; similarly the prevalence of insect pests can also increase under certain circumstances. Regular inspections will reduce the chanctes of being caught unawares.