Steinernema puertoricensis n. sp., isolated from sand collected from a coconut plantation, can be distinguished from S. glaseri, its most closely related species, by characteristics of the first generation adults. The female has a greater body length (8.6 mm) and width (375 µm). Males have the excretory pore anteriad or posteriad to the nerve ring. Spicules are arcuate and lack a hook at the ventral side of the spicule tip. Infective third-stage juveniles are over 1 mm in length. This appears to be the first species of Steinernema described from the Caribbean islands and adapted to a hot humid environment.
The effect of several isolates of entomogenous nematodes, Heterohabditis spp., from Puerto Rico was tested under laboratory conditions against larvae of Galleria mellonella, Cylas formicarius, Euscepes postfasciatus, and Cosmopolites sordidus. Five isolates demonstrated their capacity to kill the insect larvae. Isolate 2 was considered highly effective against all insects tested; isolates 14 and 27 caused high mortality rates to larvae of G. mellonella, E. postfasciatus and C. sordidus. Isolate 17 was effective against larvae of C. sordidus; isolate 18 against E. postfasciatus. The rest of the isolates tested varied greatly in their ability to kill the larvae of the insects used.
Nematode specimens found in soil about West Indian mahogany roots belonging to the genus Trophurus Loof, 1956 were found to have specific characters different from those of the three species which are included in the genus at present. A description of the new species of nematode, Trophurus longimarginatus, as well as figure 1 illustrating the same, are given in this article.
Two experiments were conducted to evaluate the effectiveness of three nematicides in the control of nematodes that affect plantain (Musa acuminata x M. balbisiana, AAB): one at the Corozal Agricultural Substation and the other at the Gurabo Substation. The results show that all of the three doses of Dasanit 15G. Mobcap 10G, and Furadan 10G tested were effective in controlling nematodes, increasing yield, and extending the useful life of the plantation so that three crops were harvested without renovating the plantation.
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