The pesticide-crop combination with the highest annual average amount of
pesticide used per ha was Chlorothalonil on tomato with 32.2 kg/ha/year,
followed by Mancozeb on corn with 28.6 kg/ha/year, and Chlorpyrifos on
chili with 26.1 kg/ha/year. The pesticide-crop combination with the
lowest average amount of pesticide used per ha per year was Brodifacoum
on rice with 2.10-4 kg/ha/year, then
followed by Metsulfuron-methyl on rice and Cypermethrin on coffee with
7.2.10-3 kg/ha/year and
1.10-2 kg/ha/year, respectively.
3.4 Comparison of Prescribed vs. Actual
Use
A comparison between prescribed and actual use was conducted to evaluate
whether the pesticides were used according to the brand-specific
prescriptions. The comparison was made for rice only, representing more
than 64% of the total surveyed area in this study. Prescribed use was
specified as the amount of pesticide brand per ha or sometimes as the
amount of pesticide brand per L fluid per application. Table 6 summarizes prescribed and actual use data reported in amount of
pesticide brand per ha and Table 7 in amount of pesticide brand
per L fluid applied. Table 6 shows that 4 out of 15 brands
(i.e., Curater 3 GR, Akodan 35 EC, Megathane 80 WP, and Allyplus 77 WP)
had lower average values of actual use than the prescribed use range.
Three out of 15 brands (i.e., Columbus 600 EC, Winder 100 EC, and Decis
25 EC) had higher average actual use values than the prescribed use
range. Table 7 shows that the average actual use of 4 out of 10
brands (i.e., Dursban 200 EC, Rizotin 100 EC, Mipcinta 50 WP, and
Curacron 500 EC) was lower than the prescribed use range, while only 1
brand (i.e., Winder 100 EC) had a higher value than prescribed.
Comparison between prescribed and actual use in other crops are listed
in Supplementary Data 4.