Treatments: pre-harvest interval, repetition and hazard to bees

Date from which harvest is permitted

max over treatments (treatment date + pre-harvest interval)

Of several treatments, the one whose interval ends latest is taken.

Window for a repeat treatment

[last date + interval_min, last date + interval_max]

A window rather than a date. It closes once the number of treatments in the season reaches the count stated in the register.

Condition for the bee hazard warning

bee hazard class ≤ II  and  the current month falls within the flowering window of at least one crop on the bed

Condition for the weather warning

v > 5 m/s  or  T > 25 °C  or  humidity < 30 %, in each of the next 3 hours

The thresholds are given by the source. The requirement that the condition holds throughout the window is the application's: the source calls the values steady without naming a period, and a single hour above the threshold is a gust.

A snapshot rather than a reference

A journal entry stores the product name and the pre-harvest interval as values rather than as a reference to a register row. The catalogue is re-crawled in full and a row identifier lives until the next crawl; furthermore, a change in the register must not retroactively move the date before which the crop is not picked.

Repeat interval

The register states the number of treatments as a figure and the interval in prose within the application method ("at an interval of 7–10 days"). Parsing is performed on the server during the crawl; two numbers reach the device. An interval qualified by a temperature condition is not taken, as the application cannot check the condition. An interval was found for 252 rows of 989.

Hazard to bees

The hazard class field in the Ministry of Agriculture catalogue is a pair separated by a backslash: hazard to humans on the left, to bees on the right. The right half is in the first class for 255 rows of 989 and is the only place in the catalogue that says anything about bees. A warning is issued when two conditions coincide: the bee hazard class is first or second, and the current month falls within the flowering window of at least one crop on the bed. The window comes from a summary of annotated iNaturalist records, in which no season is stated below fifty records.

Form of the warning

Recording the treatment is not blocked. The register prints bee-flight restrictions and buffer distances beside the class, but those fields are absent from the open data; a prohibition without them would assert more than the source states.

Weather at the hour of treatment

The official “Grundsätze für die Durchführung der guten fachlichen Praxis im Pflanzenschutz” (Bundesanzeiger No. 76a of 21 May 2010, p. 54) state that spraying at steady wind speeds above 5 m/s, steady temperatures above 25 °C or relative humidity below 30 % is to be avoided: it leads to considerable loss of product to drift and evaporation. The wording of the source is reproduced — advice, not a prohibition; recording the treatment is not blocked. Mean wind speed is used rather than gusts. The document describes practice in Germany.

Russian requirements on wind

SanPiN 1.2.2584-10, which contained a requirement for ground application, ceased to have effect on 1 March 2021. The SanPiN 2.1.3684-21 now in force (section XII) gives a wind speed of no more than 4 m/s for aerial treatments (item 283); it holds no requirement for ground spraying in a garden. That figure is therefore not used by the application.