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.