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Avocados Alerts

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7th November 2016

Six Spotted mite

Mites are causing havoc in some blocks with serious leaf-drop and very high numbers. Some growers are considering night spraying or moving the bees out so they can spray. Our advice is that you MUST keep monitoring. This allows you to take action if the mites are building up in numbers. It's too late if the leaves have dropped off the trees, plus this will seriously affect your trees for the next year or so.

Leafroller

Leafroller are increasing in number now, being mostly found in the fresh flush or the flower heads. They will shortly move to the young fruit; this is the time of year they do the most damage to the fruit. ONE spray can be applied without a monitor after flowering and before 31st of January. We advise this is better done early and a monitor before spraying will tell you if there is anything else to spray for.

Greenhouse Thrip

Juvenile thrip are being found on the old fruit at present. If they are there in high numbers now, this may mean high numbers on the new fruit from January.

Scale

There are new regulations coming out for scale as this is now recognized as a phytosanitary pest in many markets. It is important to monitor for scale now as the new crawlers will be running shortly.

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20th September 2016

Six Spotted mite

Mites are about in large numbers in some blocks. It is very important to monitor for them before bees come into the orchards. Once bees are in, it is very difficult to spray. We also advise monitoring for mites during flowering, when trees are at there greatest stress.

Leafroller

Leafroller are now being found on orchards, on the leaves and in the flowerheads. It is not wise to stop monitoring during flowering. If you monitor, you are aware of activity on your orchard and can act accordingly.

Scale

Greater numbers of scale are being seen on blocks, with many now reaching threshold. Keep an eye on your scale numbers.

Greenhouse Thrip

GHT have mostly disappeared on orchards now, though we are still finding some in places. They are not doing much damage on the fruit now, but if present now, be on the watch for them in January.

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8th March 2016

Greenhouse Thrip

Thrip are returning quickly after the application of 2 sprays 10-14 days apart. With the cooler nights, a 2 week period between sprays is now ideal. Growers who missed optimal timing of the second spray are paying for it with a need for 2 more sprays, as adults are back and laying eggs. Note also that Cryptomeria shelter or thick shelter of any sort, may harbour Thrip and be blown or fly into the blocks downwind. Spraying shelters for Thrip, when spraying the avocado trees, may result in better control

Leafroller

Most Leafroller are under control, however in some places Leafroller are returning to orchards very soon after a spray due to the warm moist weather. There is still plenty of vegetative flush to attract them.

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19th January 2016

Greenhouse Thrip

Thrip are now appearing on young fruit; both adults and juvenile have been seen in the last few day. We advise a back-to-back spray using different sprays, preferably 10-14 days apart and no longer than 21 days. These can be done with no monitor between the sprays, but often a monitor will alert you to other problems, such as Leafroller.

Leafroller

Leafroller numbers are steady with them present on many blocks but not in very high numbers. Many growers have taken action quickly this year, therefore avoiding damage to young fruit.

Six spotted mite

Most mites have now disappeared as the temperature heats up and Beneficial numbers increase. In most cases mite numbers will drop naturally and will not need spraying.

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Greenhouse Thrip 

Most blocks are Thrip free at the moment. Some may be found on old fruit, but are not a major worry for now. Thrip will be seen between young fruit from as early as mid January.

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Leafroller

Leafroller are on the increase now. We are finding tiny caterpillars in the flowerheads and bigger caterpillars on shoots. It is recommended you monitor now for Leafroller so a spray can be applied if needed before picking or the bees come in.

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Six Spotted Mite

Now is the crucial time to be monitoring for Six spotted mite. Many orchards have them present but in low numbers, but can increase quickly as the trees come into full flower, particularly if the weather is dry over the next month.

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Scale

Spring and Autumn are the times when scale crawlers hatch from beneath the adults’ shells and move to settle nearby. That makes Spring and Autumn the best times to control them, before new impenetrable waxy shells are created. CropCheck Ltd monitoring staff are looking for scale and crawlers at each visit.

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Mirids

Over flowering, myrids often occur in large numbers. They have been observed to pierce and suck sap from flower stems, thus killing flowers. However, it is still not clear whether they have a significant adverse effect. CropCheck Ltd staff will record numbers of myrids over flowering, although there is little that can be done against them once flowering has begun.

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Beneficial mites and insects

CropCheck Ltd staff are checking for predatory mites, predatory wasps, lacewings, and ladybirds at each visit. To a certain extent, the presence of beneficials can slow and sometimes negate the need for sprays, and, if selective sprays are used against a pest, a grower can encourage the populations of beneficials.

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