Atilla, your solution against pear sucker and black pears

Atilla is an insecticide based on 85% potassium bicarbonate, developed especially for effective pear psylla control.

Your advantages

  • Effective at different stages:
    • Less egg deposition
    • Kills the larvae
    • Reduces sooty mould and honeydew
  • Less discoloured pears so fewer rejections
  • No residue


  • In addition to the normal spraying products
  • Start application at low pest pressure, begin before the new egg laying in the summer
  • In block applications 3 to 4 times 5 kg/ha, weekly in dry weather
  • Repeat after 5 days in case of fast development of the pest

Practical information


  • Information about pear psylla
  • Atilla’s positioning
  • Atilla’s effects in block applications
  • Atilla’s formulation
  • Practical guidelines for applying Atilla
  • Trial results Atilla
  • Attention

Practical Recommendations for ATILLA when applied to pears:

  • Positioning in summer and after harvest
  • Start at low pressure
  • Block applications 3 to 4 times per generation
  • Spray interval of about 1 week, depending on weather conditions
  • 5.0 kg/ha orchard, max. of 9 applications a year
  • Regular spray applications of 250-300 l/ha allowed
  • Highly soluble thanks to its special formulation
  • No residue, so can be applied until right before harvest
  • Can be mixed with contact fungicides. Please contact us or your distributor for other mixing partners

What in case of high pressure and limited beneficial insects?
Atilla as a partner of classic agrochemicals

Atilla is effective at different stages and will, as a result, maintain low pressure after its application. Atilla is a contact agent; high pressure due to honeydew will result in insufficient pear psylla control. This is not the case with classic agrochemicals, although their application has its limitations as well, especially in case of heterogeneous populations, often found in summer. Combining both agents could offer a solution.

1. When to apply

Atilla is best applied to the 2nd generation (in summer) and after the harvest. We would strongly advise against applying Atilla any sooner. As Atilla is a contact agent, it should be applied during periods of slow or non-existent crop development. In contrast to systemic agrochemicals, Atilla will not affect larvae already encased in a large honeydew drop. Whereas Atilla’s formulation enables it to be effective in case of light honeydew, it is not a viable solution in high-pressure circumstances. As a result, Atilla should be regarded as a supplement to classic agrochemicals and should be used in low-pressure circumstances. Ideally, Atilla will first be used when the larvae have reached adulthood. Atilla acts as a repellent for adult insects, thus maintaining a lower pressure from the early stages of the generation.

2. Block applications

As Atilla only kills the larvae it comes into contact with, block applications are advisable in order to destroy more psylla. As an added advantage, block applications are easily applied to a heterogeneous population. Atilla is a perfect agent when dealing with populations at various growth stages. Atilla may be used 9 times a year. The best results are obtained through block applications of 3-4 times per pear psylla generation. A regular spray interval for Atilla would be about one week, which can be reduced down to 5 days in case of extremely fast development of the pest.

3. Dose rate

In Belgium, Atilla has been registered at 4.7 kg/ha canopy (7 kg/ha). Block applications in good conditions will allow for a lower dose of 3.3 kg/ha canopy or 5 kg/ha soil per application.

4. Amounts of water

Applying Atilla differs completely from current pear psylla pesticides. Atilla can be used with a small amount of water, with a regular spray application of 250-300 L/ha. Using more water is optional, but will not increase its effect, except maybe for wide planting systems. No adjuvants should be added, as they will limit Atilla’s effect. Atilla has already been formulated and requires no additional additives. A good spray technique is essential. Atilla will only be effective if coverage is ensured.

5. Temperatures

Atilla’s effect will increase on a warm day. Atilla has a desiccating effect on the larvae, which is enhanced in warm weather conditions. Like other plant protection products, Atilla should not be applied in hot temperatures (> 25°C). It is best applied in the morning or during the day. Night-time application is possible, but does not offer any advantages.

6. Rainfastness

Atilla is not rainfast and therefore it should not be applied when rain is forecasted. If the sole purpose is to destroy larvae, rainfall expected the next day is not a problem. If a large amount of honeydew is present and heavy rain occurs, the next clear day is ideally suited for an application.

7. Solubility

Potassium bicarbonate is slightly soluble in water in normal circumstances. Thanks to Atilla’s special formulation, however, it is highly soluble.

8. Tank mixes

Atilla can be mixed with most agrochemicals. The spray solution’s pH value (7.5-8.5) should, however, not be altered, as an acidic solution could cause decreased solubility and less effective pest control. As a result, we strongly advise against mixing Atilla with chemicals which would lead to acidification of the spraying solution. Potassium bicarbonate itself acts as a good buffer, as a result of which only highly acidic chemicals will lower the solution’s pH values. That’s the reason why Atilla can not be mixed with Aliette, foliar fertilisers based on calcium (exept Caltrac and Ca-EDTA) and monopotassium phosphate. As far as it is known, there are no mixing or compatibility issues with Atilla in tank mixes with most crop protection products and fertilisers. Please contact your distributor for more information on possible mixing partners.

Application chart


General information

Mode of action

The active ingredient in Atilla is potassium bicarbonate (KHCO3, 85 %), better known as baking powder. Atilla was specially formulated to attain better solubility and more efficient pear psylla control. Atilla affects various stages in the pear psylla’s life cycle. First and foremost, it acts as a repellent, deterring adults from laying eggs on trees which have been treated with Atilla. Moreover, it is very effective against the first larval stages of pear psylla, reducing the existing population. Finally, Atilla reduces honeydew and a decrease in black pears was ascertained in field trials. Block applications are essential in order to attain maximum results. Please note that Atilla’s effect is not fully noticeable after 1 application. Potassium bicarbonate is an active ingredient for which no resistance is known and for which no maximum residue limit (MRL) has been set. In addition, Atilla has no unacceptable effects on assassin bugs (Anthocoridae, e.g. Orius laevigatus) or predatory mites (Typhlodromus pyri), making the agrochemical highly suitable for integrated spray schedules for pears.


In spring, when the pear psylla larvae are difficult to hit and few beneficial insects are present, the classic agrochemicals remain the weapon of choice. In summer and after the harvest, however, Atilla is the perfect addition to your pest control, with 4-spray block applications constituting the best strategy. Atilla is a contact agent, i.e. it requires direct contact with the larvae in order for it to be effective. As such, applications in spring are not very useful, as the larvae are often hidden in the then coiled leaves. Moreover, the various larval stages in the pear psylla life cycle happen in quick succession during summer and after the harvest, more so than in spring; hence Atilla’s increased versatile effectiveness during this time of year. The added advantage of using Atilla is that it doesn’t harm the pear psylla’s natural enemies. In other words, Atilla and beneficial insects combined effectively reduce the pear psylla population in a sustainable way. Summer is also the time of year in which black pears should be avoided at all costs. Atilla leaves no residue on the fruit, making applications in the period leading up to the harvest possible. Thanks to its formulation Atilla also functions as a potassium foliar feed, increasing the potassium levels in the fruit and improving the quality of the fruit. The strategy behind Atilla’s effect is quite unique. As opposed to regular agrochemicals geared towards full pear psylla control, Atilla is aimed towards destroying roughly 80% of the population. This way, the food supply of the psylla’s natural enemies remains adequate, making it possible for them to stay in the orchard rather than leave in search of food. If applications are started in low-pressure circumstances, the number of useful insects will increase, allowing them to limit the number of pear psylla along with Atilla.

Available formulations

Globachem can offer you the following formulations based on the active ingredient potassium bicarbonate (KHCO3):

  • Potassium bicarbonate 85 SP (potassium bicarbonate 85% w/w) – soluble powder Commercial name: ATILLA

Directions for use

At the present time, ATILLA is registered in Belgium, the Netherlands and the United Kingdom.

The directions for use according the official label:

  • Belgium: ATILLA (85% potassium bicarbonate) – in Dutch and French
    • Use in pears
  • The Netherlands: ATILLA (85% potassium bicarbonate) – in Dutch
    • Use in pears
  • United Kingdom: ATILLA (85% potassium bicarbonate) – in English
    • Use in pears

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