dude, that has to bite....... what do your plants look like now?
Which product are you using, there are several insecticides they carry that are organic?
Those plants are acting like they got all moisture cut off of them.... like water was sucked from the entire system, kinda like if you grew clones in a dome and never weaned them to lower humidity.
What are your humidity levels?
How big are those pots? Gallon size?
Few things here, I see you are watering where the plant is which is what you are supposed to do when you have a small plant in a big pot.
When plants are low on water and you use any type of horticultural oils it can cause this problem, because of the way they work by smothering the insect...
It's the mineral oil, because of this..... with it being thick and the plant absorbs it; it can cause clogging of the inside of the plants vascular tissue, not to mention if you got a plant that is touchy to oils.... also if used too heavily can do it too....
In humans mineral oil can flush out your system and can cause dehydration; since your plants look like they have never been watred; there is a
high probability that your plants did not like the mineral oil, or the product contained too much/quality of the oil was bad.
here is what I am talking about in more detail.
Localization and movement of mineral oil in plants by fluorescence and confocal microscopy
Naturally occurring acidic compounds in oils, and such compounds formed largely by oxidation of unsaturated molecules present in most contemporary HMOs and AMOs, cause acute effects that are generally observed as burns and necrotic lesions shortly after application of oil to plants.
These effects are primarily related to cell death due to disruption of membranes by the acidic compounds, and are influenced by oil quality, dose, and ambient conditions, particularly temperature, humidity, and ultraviolet light (Hodgkinson et al., 2002Go). Such symptoms are perhaps the most widely recognized form of phytotoxicity and are commonly associated with oils with relatively high levels (≥8%) of unsaturated molecules. However, acute phytotoxicity such as rapid leaf drop may also result from the impact of high dose applications of HMOs and AMOs on plant growth regulators
(Johnson et al., 2002Go).
These dramatic effects are most common when sprays are applied to moisture-stressed plants, immediately before or after extreme ambient temperatures and humidity. The risk increases with increasing median nCy values, and is generally related to the persistence of isoalkanes and cycloalkanes on sprayed surfaces. Such molecules comprise ≥92% of molecules in HMOs and AMOs. Under such extreme conditions, slowly volatilizing oil deposits lead to ethylene-induced abscission (Johnson et al., 2002Go).
Under average conditions and in the absence of moisture stress, high doses of products, particularly high molecular weight HMOs and AMOs, may cause chronic symptoms, such as loss of vigour, leaf and fruit drop, and reduced flowering and fruit set (Furness and Maelzer, 1981Go; Beattie et al., 1989Go).
The causes of this type of phytotoxicity are poorly understood and the manner and consequences of the movement of petroleum-derived spray oils within plants under different conditions have been largely ignored despite their importance in selecting the appropriate oil to use. Although the penetration and movement of herbicidal oils in some plants have been demonstrated since the 1950s (van Overbeek and Blondeau, 1954Go; Gauvrit and Cabanne, 1993Go), the last detailed studies on the movement of pesticidal oils into, and within, plants were reported by Knight et al. (1929)Go and Rohrbaugh (1934Go, 1941Go) for citrus, and by Young (1933Go, 1934Go, 1935Go, 1936Go, 1941Go) for apples and vegetables. These important studies have not received the attention they deserve given the potential for oil to interfere with gas exchange and translocation of water and metabolites