NOVELTY - Isolated, purified or substantially pure lipid (I) is new.    USE - (I) is use for controlling one or more insects including phytopathogenic insect or the order Hemiptera, where the phytopathogenic insect is mosquito, moths including diamond back moth, Thrips (Thysanoptera), aphids, psyllids, scale or whitefly (all claimed).    ADVANTAGE - (I) has reduced environmental contamination, and increased sustainability. The composition is a stable and capable of retaining insecticidal efficacy for a period greater than 2 months.    DETAILED DESCRIPTION - Isolated, purified or substantially pure lipid having structure of formula (R2-C(=O)-O-C(CH2-O-C(=O)-R1)-CH2-O-CH2-CH2-CH-N(R3)(R4)(R5)-C(=O)-O-) (I) is new.    R1, R2 = aliphatic portion of a fatty acid; and    R3-R5 = alkyl, alkenyl, alkynyl or aryl (all optionally substituted), H, OH, carboxyl or amide.    INDEPENDENT CLAIMS are included for:    (1) a composition comprising one or more lipids together with one or more carriers;    (2) the preparation of (I);    (3) a method-1 of reversing, wholly or in part, the resistance of an insect to one or more insecticides or one or more entomopathogenic agents, comprising either applying to a locus, or contacting the insect with, the lipids or a functional variant, or the composition, or applying to a locus, or contacting the one or more insects with, an entomopathogenic fungi, optionally together with an insecticide or entomopathogenic agent;    (4) a method-2 of preparing a composition having insecticidal activity against an insect, comprising isolating one or more of the lipids from a culture of cells capable of synthesizing the lipids, and combining the lipids with a carrier to form the composition;    (5) a method-3 for producing a biological control composition, comprising providing a culture of one or more fungi of the phylum Ascomycota, maintaining the culture under conditions suitable for production of at least one lipid, and combining the lipid with a carrier, or combining the lipid with one or more entomopathogenic fungi or separating the lipid from the fungi or fungal culture, or at least partially purifying and/or isolating the lipid to form the composition; and    (6) use of an organic solvent extract from a culture of one or more fungi of the phylum Ascomycota in the manufacture of a composition for the control of insects, where the organic solvent extract comprises the lipids.