## 3 Results  
### Determination of Antimicrobial Activity  
The reading was performed 24 h and 48 h after incubating. A ruler was used to take the reading while also measuring the disc's diameter and the resulting zone of inhibition. Two Petri dishes with the three different volatile oil were produced, one for each species of microorganism. Figure 1 shows the Petri dishes with the analyzed samples. The three types of volatile oils were numbered: A, B, and C. A represents the lavender volatile oil sample, B represents the mint volatile oil sample, and C represents the fennel volatile oil sample. The Petri dishes were seeded with the four microorganisms, and their numbering was as follows: 1 represents the dish seeded with _Geotrichum candidum_, 2 represents the dish seeded with _Penicillium expansum_, 3 represents the dish seeded with _Aspergillus niger_, and 4 represents the dish seeded with _Escherichia coli_. In terms of the inhibitory action against _Penicillium expansum_ for volatile fennel oil, the mean of the zone of inhibition's diameter is 11.5 \(\pm\) 0.707 mm after 24 h, and after 48 h, it is 17\(\pm\) 0.707 mm, yielding an intermediate qualification. After the first 24 h, the inhibitory zone's mean diameter in the case of volatile lavender oil is 11 \(\pm\) 0 mm, yielding a high qualification. After 48 h, the mean is 14.5 \(\pm\) 0.707 mm, the qualification being intermediate. In the first 24 h, the volatile mint oil has a mean diameter of the inhibition zone of 24.5 \(\pm\) 0.707 mm, the qualification obtained being sensitive. After 48 h, the mean is 27 \(\pm\) 0 mm; the qualification is still sensitive. The highest sensitivity of _Penicillium expansum_ is to the volatile mint oil, being resistant or intermediate to the other two. Figure 2 shows the inhibitory action of fennel, lavender, and mint volatile oils against _Penicillium expansum_, _Apergillus niger_, _Geotrichum candidum_, and _Escherichia coli_. Regarding the fennel volatile oil's ability to inhibit _Apergillus niger_, the inhibition zone's average diameter over the first 24 h was 9.5 \(\pm\) 0.707 mm, resulting in the qualification of resistance. After 48 h, the inhibitory zone's mean diameter is 12 \(\pm\) 0 mm; resistance is therefore qualified. After 24 h, the mean for the volatile oil of lavender is 10.5 \(\pm\) 0.707 mm, indicating that it is resistant. After 48 h, the mean is 13 \(\pm\) 0 mm, the qualification obtained being resistant. The volatile mint oil has a mean diameter of the inhibition zone  
Figure 1: Zone of inhibition after 48 h: 1. _Geotrichum candidum_; 2. _Penicillium expansum_; 3. _Apergillus niger_; 4. _Escherichia coli_; A. Lavender volatile oil; B. Mint volatile oil; C. Fennel volatile oil. Figure 2: The inhibitory action of fennel, lavender, and mint volatile oils against _Penicillium expansum_, _Apergillus niger_, _Geotrichum candidum_, and _Escherichia coli_. of 10 \(\pm\) 0 mm in the first 24 h, with the qualifier being resistant. After 48 h, the mean is 12.5 \(\pm\) 0.707 mm, the qualification obtained being resistant. The inhibitory action increases between 24 and 48 h for all three volatile oils. All three oils indicate _Aspergillus niger_ resistance, with volatile lavender oil producing the greatest results and fennel volatile oil producing the worst. After 24 h, the fennel volatile oil's inhibition activity against _Geotrichum candidum_ has a mean diameter of the inhibition zone of 11.5 \(\pm\) 0.707 mm, falling into the category of being resistant. After 48 h, the mean is 14 \(\pm\) 0 mm; the qualification is still resistant. The average diameter of the zone of inhibition of volatile lavender oil after 24 h is 11.5 \(\pm\) 0.707 mm, with the descriptor \"resistant.\" After 48 h, the mean is 15.5 \(\pm\) 0.707 mm, the qualification to which it falls being intermediate. For volatile mint oil, the mean after 24 h is 22 \(\pm\) 0 mm, the qualifier being sensitive. After 48 h, the mean is 24.5 \(\pm\) 0.707 mm, the qualification is still sensitive.